diff --git a/src/module/data/spell.mjs b/src/module/data/spell.mjs
index 90237d28..64651fe9 100644
--- a/src/module/data/spell.mjs
+++ b/src/module/data/spell.mjs
@@ -22,8 +22,8 @@ export class SpellDataModel extends BaseItem {
             hauszauber: new BooleanField(),
             technik: new StringField(),
             zauberdauer: new SchemaField({
-                min: new NumberField(),
-                normal: new NumberField(),
+                min: new StringField(),
+                normal: new StringField(),
                 additionalFormula: new StringField(),
                 variables: new ArrayField(new StringField()),
                 additionalFormulaTimeUnit: new StringField(),
diff --git a/src/module/data/spomods/spoModData.mjs b/src/module/data/spomods/spoModData.mjs
new file mode 100644
index 00000000..66c4d199
--- /dev/null
+++ b/src/module/data/spomods/spoModData.mjs
@@ -0,0 +1,66 @@
+const data = {
+
+    "Veränderte Technik": {
+        name: "Veränderte Technik",
+        description: "Verändert die Technik",
+        mod: -7,
+        castTimeMod: 3,
+        castTimeMode: "Addition"
+    },
+    "Veränderte Technik, zentral": {
+        name: "Veränderte Technik, zentral",
+        description: "Verändert die Technik",
+        mod: -12,
+        castTimeMod: 3,
+        castTimeMode: "Addition"
+    },
+    "Halbierte Zauberdauer": {
+        name: "Halbierte Zauberdauer",
+        description: "Halbiert die Zauberdauer für eine Erschwernis von 5",
+        mod: -5,
+        castTimeMod: 0.5,
+        castTimeMode: "Multiply"
+    },
+    "Verdoppelte Zauberdauer": {
+        name: "Verdoppelte Zauberdauer",
+        description: "Verdoppelt die Zauberdauer für eine Erleichterung von 3",
+        mod: 3,
+        castTimeMod: 2,
+        castTimeMode: "Multiply"
+    },
+    "Erzwingen": {
+        name: "Erzwingen",
+        description: "Verringert Erschwernis um 1 je doppelten AsP Punkt",
+        mod: -1,
+        castTimeMod: 1,
+        castTimeMode: "Addition"
+    },
+    "Kosten einsparen": {
+        name: "Kosten einsparen",
+        description: "Reduziert die Kosten des Zaubers um 10% für jede zusätzlich aufgewendete Aktion",
+        mod: 3,
+        castingCosts: 0.1,
+        castingCostsMode: "Multiply",
+        castTimeMod: 1,
+        castTimeMode: "Addition"
+    },
+    // more to come
+    "Vergrößerung von Reichweite oder Wirkungsradius": {
+        name: "Vergrößerung von Reichweite oder Wirkungsradius",
+        description: "Vergrößert die Reichweite oder wenn möglich den Wirkungsradius auf kosten von Aktionen",
+        mod: 5,
+        castTimeMod: 1,
+        castTimeMode: "Addition"
+    },
+    "Verkleinerung von Reichweite oder Wirkungsradius": {
+        name: "Verkleinerung von Reichweite oder Wirkungsradius",
+        description: "Verkleinert die Reichweite oder wenn möglich den Wirkungsradius auf kosten von Aktionen",
+        mod: 3,
+        castTimeMod: 1,
+        castTimeMode: "Addition"
+    },
+
+
+}
+
+export default data
\ No newline at end of file
diff --git a/src/module/dialog/spellDialog.mjs b/src/module/dialog/spellDialog.mjs
index 3f99c2e9..5d03ffba 100644
--- a/src/module/dialog/spellDialog.mjs
+++ b/src/module/dialog/spellDialog.mjs
@@ -1,5 +1,6 @@
 import {Talent} from "../data/talent.mjs";
 import {ATTRIBUTE} from "../data/attribute.mjs";
+import SpoModData from "../data/spomods/spoModData.mjs";
 
 const {
     ApplicationV2,
@@ -44,23 +45,32 @@ export class SpellDialog extends HandlebarsApplicationMixin(ApplicationV2) {
      * @private
      */
     _actor = null
-    _mutators = {}
+    _costMutators = {}
+    _castTimeMutators = {}
     _variants = {}
     _costModel = {}
+    _castTimeModel = {}
     displayModResult = 0
 
     constructor(actor, spellId) {
         super()
         this._actor = actor
         this._spell = this._actor.itemTypes["Spell"].find(p => p._id === spellId)
-        this.displayModResult = Number(this._spell.system.zfw)
         this._circumstance = 0
         this._mods = []
-        this._mutators = {}
+        this.mod = 0
+        this._costMutators = {}
+        this._castTimeMutators = {}
         this._selectedRepresentation = null
         this._spellDie = null
         this._variants = {}
-        this._costModel = {}
+        this._costModel = this._spell.system.kosten.find(c => c.repräsentation === context.selectedRepresentation) ?? this._spell.system.kosten.find(c => c.repräsentation === "")
+        this._castTimeModel = this._spell.system.zauberdauer
+        this._castTimeMutators = {}
+        this._costMutators = {}
+        this._costModel.variables.forEach(v => this._costMutators[v] = 0)
+        this._castTimeModel.variables.forEach(v => this._castTimeMutators[v] = 0)
+        this.cost = this.normalizeCastingCost() ?? 0
     }
 
     /**
@@ -100,24 +110,34 @@ export class SpellDialog extends HandlebarsApplicationMixin(ApplicationV2) {
         }
         if (this._selectedRepresentation) {
             this._costModel = this._spell.system.kosten.find(c => c.repräsentation === context.selectedRepresentation) ?? this._spell.system.kosten.find(c => c.repräsentation === "")
-            this._mutators = {}
-            this._costModel.variables.forEach(v => this._mutators[v] = 0)
+            this._castTimeModel = this._spell.system.zauberdauer
+            this._castTimeMutators = {}
+            this._costMutators = {}
+            this._costModel.variables.forEach(v => this._costMutators[v] = 0)
+            this._castTimeModel.variables.forEach(v => this._castTimeMutators[v] = 0)
         }
-        let mutators = foundry.utils.expandObject(formData.object)["mutators"]
+        let costMutators = foundry.utils.expandObject(formData.object)["costMutators"]
 
-        if (mutators) {
-            this._mutators = mutators
+        if (costMutators) {
+            this._costMutators = costMutators
         }
 
-        this.displayModResult = Number(this._spell.system.zfw)
+        this.cost = this.normalizeCastingCost()
 
+        let castTimeMutators = foundry.utils.expandObject(formData.object)["castTimeMutators"]
+
+        if (castTimeMutators) {
+            this._castTimeMutators = castTimeMutators
+        }
+
+        this.mod = 0
         this._activeVariants = Object.entries(this._variants)
             .filter(([key, truthiness]) => truthiness)
             .map(([key, truthiness]) => this._spell.system.varianten.find(v => v.name === key))
         this._activeVariants.forEach(variant => {
 
             if (variant.mod) {
-                this.displayModResult += Number(variant.mod)
+                this.mod += Number(variant.mod)
             }
 
         })
@@ -129,6 +149,23 @@ export class SpellDialog extends HandlebarsApplicationMixin(ApplicationV2) {
 
     }
 
+    normalizeCastingCost() {
+
+        let costFormula = this._costModel.additionalFormula
+
+        this._costModel.variables.forEach(v => {
+
+            costFormula = costFormula.replace(v, this._costMutators[v])
+
+        })
+
+        costFormula = Number(eval(costFormula)) + Number(this._costModel.cost)
+        if (costFormula <= this._costModel.min) {
+            costFormula = this._costModel.min
+        }
+        return costFormula
+    }
+
     /**
      *
      * @param spell
@@ -141,20 +178,50 @@ export class SpellDialog extends HandlebarsApplicationMixin(ApplicationV2) {
         // normal: Standard Zauberzeit eines Zaubers
         // additionalFormulaData: enthält die zur Normalzeit zusätzlichen Zauberdauer
 
-        const castingTime = spell.system.zauberdauer
-
-        // direct actions
-        const aktionenRegExp = /(.*) Aktionen/
-        const srRegExp = /(.*) SR/
-
-        if (castingTime.match(aktionenRegExp)) {
-            const [_, actions] = castingTime.match(aktionenRegExp)
-            return actions
-        } else if (castingTime.match(srRegExp)) {
-            const [_, actions] = castingTime.match(srRegExp)
-            return actions * 20
+        const castingTime = spell.system.zauberdauer.normal ?? 0
+        let baseCastTime = 0
+        const minCastingTime = spell.system.zauberdauer.min ?? 0
+        let baseMinCastTime = 0
+        if (castingTime) {
+            baseCastTime = castingTime.replace(/(.*) Aktionen/g, (_, aktionen) => {
+                return aktionen
+            })
+            baseCastTime = baseCastTime.replace(/(.*) SR/g, (_, aktionen) => {
+                return aktionen * 20
+            })
         }
-        return -1
+        if (minCastingTime) {
+            baseMinCastTime = minCastingTime.replace(/(.*) Aktionen/g, (_, aktionen) => {
+                return aktionen
+            })
+            baseMinCastTime = baseMinCastTime.replace(/(.*) SR/g, (_, aktionen) => {
+                return aktionen * 20
+            })
+        }
+
+        let actualCastingTime = 0
+        let formula = spell.system.zauberdauer.additionalFormula
+        if (formula) {
+            Object.entries(this._castTimeMutators).forEach(([variableName, variableValue]) => {
+                console.log(variableName, variableValue)
+                formula = formula.replaceAll(variableName, variableValue)
+            })
+
+            if (spell.system.zauberdauer.additionalFormulaTimeUnit == "Aktionen") {
+                actualCastingTime = (Number(baseCastTime) + Number(eval(formula)) ?? 0)
+            } else {
+                actualCastingTime = (Number(baseCastTime) + (Number(eval(formula)) * 20) ?? 0)
+            }
+
+        } else {
+            actualCastingTime = baseCastTime
+        }
+
+        if (Number(actualCastingTime) <= Number(baseMinCastTime)) {
+            actualCastingTime = baseMinCastTime
+        }
+
+        return actualCastingTime
     }
 
     _configureRenderOptions(options) {
@@ -180,8 +247,12 @@ export class SpellDialog extends HandlebarsApplicationMixin(ApplicationV2) {
         context.text = this._spell.system.wirkung
         context.dice = []
         context.colorfulDice = game.settings.get('DSA_4-1', 'optional_colorfuldice')
-        context.modResult = this.displayModResult
-        context.displayModResult = (context.modResult > 0 ? "+" : "") + this.displayModResult
+        context.modResult = this._spell.system.zfw - this.mod
+        context.penalty = (this.mod > 0 ? "+" : "") + this.mod
+        context.displayModResult = (context.modResult > 0 ? "+" : "") + context.modResult
+        context.castingTime = this.#normalizeCastingTime(this._spell)
+
+        // variable probe (should consider Achaz as they can replace one KL in a KL/KL/* spell with IN
 
         this._spell.system.probe.map(p => {
             if (p === "*") {
@@ -214,28 +285,48 @@ export class SpellDialog extends HandlebarsApplicationMixin(ApplicationV2) {
             }
         })
 
+        // Repräsentation
+
         context.representationOptions[""] = ""
         Object.entries(this._spell.system.repräsentation).forEach(([key, value]) => {
             context.representationOptions[key] = key
         })
 
+        // Costs and Mutators
+
+        context.castingCosts = this.cost
+
 
         // set probe to current held probe variables or take from _spell
-        context.mutators = this._mutators
+        context.costMutators = this._costMutators
 
 
         if (this._costModel) {
-            context.variables = this._costModel.variables
+            context.costVariables = this._costModel.variables
         } else {
-            context.variables = []
+            context.costVariables = []
         }
 
+        // SpoMods
+        context.spoMods = []
+        if (this._spell.system.modifikationen) {
+            this._spell.system.modifikationen.split(",").forEach(spoMod => {
 
-        // generate a list of variables in cost and castTime
-
-        // generate a list of variants
-
-        // generate a list of SpoMods
+                switch (spoMod.trim()) {
+                    case "Zauberdauer":
+                        context.spoMods.push(SpoModData["Halbierte Zauberdauer"])
+                        context.spoMods.push(SpoModData["Verdoppelte Zauberdauer"])
+                        break;
+                    case "Kosten":
+                        context.spoMods.push(SpoModData["Kosten einsparen"])
+                        break;
+                    case "Reichweite":
+                        context.spoMods.push(SpoModData["Verkleinerung von Reichweite oder Wirkungsradius"])
+                        context.spoMods.push(SpoModData["Vergrößerung von Reichweite oder Wirkungsradius"])
+                        break;
+                }
+            })
+        }
 
         return context
     }
diff --git a/src/templates/dialog/spell-dialog.hbs b/src/templates/dialog/spell-dialog.hbs
index 12d11e40..50a3aab6 100644
--- a/src/templates/dialog/spell-dialog.hbs
+++ b/src/templates/dialog/spell-dialog.hbs
@@ -50,17 +50,39 @@
         </fieldset>
     {{/if}}
 
-    <fieldset>
-        <legend>Modifikationen</legend>
-
+    {{#if this.spoMods}}
+        <fieldset class="scroll-y">
+            <legend>Spontane Modifikation</legend>
+            <div class="variantList">
+                {{#each this.spoMods}}
+                    <div class="variant" data-tooltip="{{{description}}}">
+                        <div class="selection">
+                            <label>
+                                <input type="checkbox" name="spoMods.{{name}}" {{checked variantChecked}}>
+                                {{#if (gte mod 0)}}+{{/if}}{{mod}}
+                            </label>
+                        </div>
+                        <div class="variantText">
+                            <em>{{name}}</em>
+                        </div>
+                    </div>
+                {{/each}}
+            </div>
     </fieldset>
+    {{/if}}
 
     <fieldset>
         <legend>Variablen</legend>
-        {{#each variables}}
+        {{#each castTimeVariables}}
             <div>
                 <label for="{{this}}">{{this}}: </label>
-                <input type="number" name="mutators.{{this}}" value="{{lookup ../mutators this}}"/>
+                <input type="number" name="castTimeMutators.{{this}}" value="{{lookup ../castTimeMutators this}}"/>
+            </div>
+        {{/each}}
+        {{#each costVariables}}
+            <div>
+                <label for="{{this}}">{{this}}: </label>
+                <input type="number" name="costMutators.{{this}}" value="{{lookup ../costMutators this}}"/>
             </div>
         {{/each}}
     </fieldset>
@@ -69,10 +91,10 @@
     <fieldset>
         <legend>Dauer und Kosten</legend>
         <div class="malus-and-mod">
-            <label><span>Zauberdauer</span>
+            <label><span>Zauberdauer (A)</span>
                 <output name="castingTime">{{castingTime}}</output>
             </label>
-            <label><span>Kosten</span>
+            <label><span>Kosten (AsP)</span>
                 <output name="costs">{{castingCosts}}</output>
             </label>
             <label><span>Erschwernis</span>