diff --git a/libs/sr-formula/src/data/common/index.ts b/libs/sr-formula/src/data/common/index.ts
index 1567277146..0592655e46 100644
--- a/libs/sr-formula/src/data/common/index.ts
+++ b/libs/sr-formula/src/data/common/index.ts
@@ -11,10 +11,10 @@ const data: TagMapNodeEntries = [
   reader.withTag({ src: 'iso', et: 'self' }).reread(reader.src('custom')),
   reader.withTag({ src: 'agg', et: 'self' }).reread(reader.src('custom')),
 
-  // convert src:char, lightCone, relic to src:agg for accumulation
-  reader.src('agg').add(reader.sum.src('char')),
-  reader.src('agg').add(reader.sum.src('lightCone')),
-  reader.src('agg').add(reader.sum.src('relic')),
+  // convert src:char, lightCone to src:agg for accumulation
+  // src: relic is reread in src/util.ts:relicsData()
+  reader.src('agg').reread(reader.src('char')),
+  reader.src('agg').reread(reader.src('lightCone')),
 
   // Final <= Premod <= Base
   reader
diff --git a/libs/sr-formula/src/data/util/read.ts b/libs/sr-formula/src/data/util/read.ts
index 7c25109f57..02cf979714 100644
--- a/libs/sr-formula/src/data/util/read.ts
+++ b/libs/sr-formula/src/data/util/read.ts
@@ -25,7 +25,7 @@ import {
 } from './listing'
 
 export const fixedTags = {
-  presets: presets,
+  preset: presets,
   member: members,
   dst: members,
   et: entryTypes,
@@ -117,6 +117,55 @@ export function tagVal(cat: keyof Tag): TagValRead {
   return baseTagVal(cat)
 }
 
+export function tagStr(tag: Tag, ex?: any): string {
+  const {
+    name,
+    preset,
+    member,
+    dst,
+    et,
+    src,
+    q,
+    qt,
+    type,
+    attackType,
+    ...remaining
+  } = tag
+
+  if (Object.keys(remaining).length) console.error(remaining)
+
+  let result = '{ ',
+    includedRequired = false,
+    includedBar = false
+  function required(str: string | undefined | null) {
+    if (!str) return
+    result += str + ' '
+    includedRequired = true
+  }
+  function optional(str: string | undefined | null) {
+    if (!str) return
+    if (includedRequired && !includedBar) {
+      includedBar = true
+      result += '| '
+    }
+    result += str + ' '
+  }
+  required(name && `#${name}`)
+  required(preset)
+  required(member)
+  required(dst && `(${dst})`)
+  required(src)
+  required(et)
+  if (qt && q) required(`${qt}.${q}`)
+  else if (qt) required(`${qt}.`)
+  else if (q) required(`.${q}`)
+
+  optional(type)
+  optional(attackType)
+  required(ex && `[${ex}]`)
+  return result + '}'
+}
+
 export const reader = new Read({}, undefined)
 export const usedNames = new Set<string>()
 export const usedQ = new Set('_')
diff --git a/libs/sr-formula/src/debug.ts b/libs/sr-formula/src/debug.ts
index 1202b21098..9a88c8ed4c 100644
--- a/libs/sr-formula/src/debug.ts
+++ b/libs/sr-formula/src/debug.ts
@@ -1,11 +1,21 @@
 import type {
   AnyNode,
+  CalcResult,
   ReRead,
   TagMapSubsetCache,
 } from '@genshin-optimizer/pando'
-import { TagMapExactValues, traverse } from '@genshin-optimizer/pando'
-import type { Read, Tag } from './data/util'
-import type { Calculator } from './calculator'
+import {
+  Calculator as BaseCalculator,
+  TagMapExactValues,
+  TagMapKeys,
+  traverse,
+} from '@genshin-optimizer/pando'
+import { type Calculator } from './calculator'
+import { keys } from './data'
+import { tagStr, type Read, type Tag, type TagMapNodeEntry } from './data/util'
+
+const tagKeys = new TagMapKeys(keys)
+export const debugKey = Symbol('tagSource')
 
 export function dependencyString(read: Read, calc: Calculator) {
   const str = listDependencies(read.tag, calc).map(({ tag, read, reread }) => {
@@ -30,8 +40,7 @@ export function listDependencies(
   const result: { tag: Tag; read: Tag[]; reread: Tag[] }[] = [],
     stack: Tag[] = []
   /** Stack depth when first encountered the tag, or 0 if already visited */
-  const tagKeys = calc.keys
-  const openDepth = new TagMapExactValues<number>(tagKeys.tagLen, {})
+  const openDepth = new TagMapExactValues<number>(keys.tagLen, {})
 
   function internal(cache: TagMapSubsetCache<AnyNode | ReRead>) {
     const tag = cache.tag,
@@ -81,3 +90,132 @@ export function listDependencies(
   internal(calc.nodes.cache(calc.keys).with(tag))
   return result
 }
+
+export function printEntry({ tag, value }: TagMapNodeEntry): string {
+  function printNode(node: AnyNode): string {
+    const { op, tag, br, x } = node
+    let { ex } = node
+    if (op === 'const') return JSON.stringify(ex)
+    if (op === 'read') return `${node}`
+    if (op === 'subscript') ex = undefined
+    const args: string[] = []
+    if (ex) args.push(JSON.stringify(ex))
+    if (tag) args.push(tagStr(tag))
+    args.push(...br.map(printNode), ...x.map(printNode))
+    return `${op}(` + args.join(', ') + ')'
+  }
+
+  if (value.op === 'reread') return tagStr(tag) + ` <- ` + tagStr(value.tag)
+  return tagStr(tag) + ` <= ` + printNode(value)
+}
+
+export type DebugMeta = {
+  valText: string
+  text: string
+  deps: DebugMeta[]
+}
+export class DebugCalculator extends BaseCalculator<DebugMeta> {
+  override computeMeta(
+    n: AnyNode,
+    val: number | string,
+    x: (CalcResult<number | string, DebugMeta> | undefined)[],
+    br: CalcResult<number | string, DebugMeta>[],
+    tag: Tag | undefined
+  ): DebugMeta {
+    const result: DebugMeta = {
+      valText: valStr(val),
+      text: '',
+      deps: [],
+    }
+    function toStr(
+      x: CalcResult<number | string, DebugMeta> | undefined
+    ): string {
+      if (!x) return ''
+      result.deps.push(...x.meta.deps)
+      return x.meta.text
+    }
+
+    function valStr(val: number | string): string {
+      if (typeof val !== 'number') return `"${val}"`
+      if (Math.round(val) === val) return `${val}`
+      return val.toFixed(2)
+    }
+
+    const { op, ex, tag: nTag } = n
+    switch (op) {
+      case 'const':
+        result.text = result.valText
+        break
+      case 'read': {
+        const args = x as CalcResult<number | string, DebugMeta>[]
+        return {
+          valText: result.valText,
+          text: tagStr(nTag!, ex),
+          deps: [
+            {
+              valText: result.valText,
+              text: `expand ${tagStr(nTag!, ex)} (${tagStr(tag!)})`,
+              deps: args.map(({ meta, entryTag }) => ({
+                ...meta,
+                text: `${entryTag?.map((tag) => tagStr(tag)).join(' <- ')} <= ${
+                  meta.text
+                }`,
+              })),
+            },
+          ],
+        }
+      }
+      case 'match':
+      case 'thres':
+      case 'lookup': {
+        const chosen = x.find((x) => x)!
+        result.text = `${op}(${br.map(toStr).join(', ')} => ${toStr(chosen)})`
+        break
+      }
+      case 'subscript': {
+        const [index] = br
+        const chosen = valStr(ex[index.val as number]!)
+        result.text = `subscript(${toStr(index)} => ${chosen})`
+        break
+      }
+      case 'tag':
+        result.text = `tag(${tagStr(nTag!)}, ${toStr(x[0])})`
+        break
+      case 'dtag':
+        result.text = `dtag(${br
+          .map((br, i) => `${ex[i]} => ${toStr(br)}`)
+          .join(', ')}; ${toStr(x[0])})`
+        break
+      default: {
+        const specialArgs = ex ? [JSON.stringify(ex)] : []
+        const brArgs = br.map(toStr)
+        const xArgs = x.map(toStr)
+        const args = [specialArgs, brArgs, xArgs].map((x) => x.join(', '))
+
+        result.text = `${op}(` + args.filter((x) => x.length).join('; ') + ')'
+      }
+    }
+    return result
+  }
+
+  debug(node: AnyNode): string[] {
+    const { meta } = this.compute(node)
+    const result: string[] = []
+    const found = new Set<DebugMeta>()
+
+    function print(meta: DebugMeta, level: number) {
+      const indent = Array(2 * level + 1).join(' ')
+      const line = `${meta.valText} ${meta.text}`
+
+      if (found.has(meta)) {
+        result.push(indent + line + ' (Dup)')
+      } else {
+        found.add(meta)
+        result.push(indent + line)
+        meta.deps.forEach((dep) => print(dep, level + 1))
+      }
+    }
+    print(meta, 0)
+    return result
+  }
+}
diff --git a/libs/sr-formula/src/index.ts b/libs/sr-formula/src/index.ts
index 278dbb08c0..a68e0aa4c9 100644
--- a/libs/sr-formula/src/index.ts
+++ b/libs/sr-formula/src/index.ts
@@ -4,6 +4,7 @@ import { Calculator } from './calculator'
 import { keys, values } from './data'
 export { Calculator } from './calculator'
 export * from './data/util'
+export * from './debug'
 export * from './util'
 
 export function srCalculatorWithValues(extras: TagMapEntries<number>) {