[REACTION:DEAD_BOOK_ADV]
[NAME:Craft a book of Necropolis]
[ADVENTURE_MODE_ENABLED]
[REAGENT:BODY:1:NONE:NONE:CREATURE_MAT:HUMAN:SKIN][UNROTTEN][ANY_LEATHER_MATERIAL]
[REAGENT:BODY:1:NONE:NONE:CREATURE_MAT:HUMAN:SKIN][UNROTTEN][ANY_LEATHER_MATERIAL]
[REAGENT:BODY:1:NONE:NONE:CREATURE_MAT:HUMAN:SKIN][UNROTTEN][ANY_LEATHER_MATERIAL]
[REAGENT:BODY:1:NONE:NONE:CREATURE_MAT:HUMAN:SKIN][UNROTTEN][ANY_LEATHER_MATERIAL]
[REAGENT:B:1:NONE:NONE:CREATURE_MAT:HUMAN:BONE][UNROTTEN][USE_BODY_COMPONENT][ANY_BONE_MATERIAL]
[REAGENT:B:1:NONE:NONE:CREATURE_MAT:HUMAN:BONE][UNROTTEN][USE_BODY_COMPONENT][ANY_BONE_MATERIAL]
[REAGENT:B:1:NONE:NONE:CREATURE_MAT:HUMAN:BONE][UNROTTEN][USE_BODY_COMPONENT][ANY_BONE_MATERIAL]
[REAGENT:B:1:NONE:NONE:CREATURE_MAT:HUMAN:BONE][UNROTTEN][USE_BODY_COMPONENT][ANY_BONE_MATERIAL]
[REAGENT:B:1:NONE:NONE:CREATURE_MAT:HUMAN:BONE][UNROTTEN][USE_BODY_COMPONENT][ANY_BONE_MATERIAL]
[REAGENT:B:1:NONE:NONE:CREATURE_MAT:HUMAN:BONE][UNROTTEN][USE_BODY_COMPONENT][ANY_BONE_MATERIAL]
[PRODUCT:100:1:NONE:TOOL:ITEM_TOOL_DEAD:CREATURE_MAT:HUMAN:SKIN]
[SKILL:BONECARVE]
try that, it should give you a "human skin book of necropolis"
EDIT: or this works as well (more aproparite in case you wanted a different material
[
PRODUCT:100:1:TOOL:ITEM_TOOL_DEAD:GET_MATERIAL_FROM_REAGENT:BODY:NONE]
Acaully looking at the reaction closer... It looks wrong... it should be
[REACTION:DEAD_BOOK_ADV]
[NAME:Craft a book of Necropolis]
[ADVENTURE_MODE_ENABLED]
[REAGENT:BODY:1:NONE:NONE:CREATURE_MAT:HUMAN:SKIN][UNROTTEN][ANY_LEATHER_MATERIAL]
[REAGENT:
BODY2:1:NONE:NONE:CREATURE_MAT:HUMAN:SKIN][UNROTTEN][ANY_LEATHER_MATERIAL]
[REAGENT:
BODY3:1:NONE:NONE:CREATURE_MAT:HUMAN:SKIN][UNROTTEN][ANY_LEATHER_MATERIAL]
[REAGENT:
BODY4:1:NONE:NONE:CREATURE_MAT:HUMAN:SKIN][UNROTTEN][ANY_LEATHER_MATERIAL]
[REAGENT:B:1:NONE:NONE:CREATURE_MAT:HUMAN:BONE][UNROTTEN][USE_BODY_COMPONENT][ANY_BONE_MATERIAL]
[REAGENT:
B2:1:NONE:NONE:CREATURE_MAT:HUMAN:BONE][UNROTTEN][USE_BODY_COMPONENT][ANY_BONE_MATERIAL]
[REAGENT:
B3:1:NONE:NONE:CREATURE_MAT:HUMAN:BONE][UNROTTEN][USE_BODY_COMPONENT][ANY_BONE_MATERIAL]
[REAGENT:
B4:1:NONE:NONE:CREATURE_MAT:HUMAN:BONE][UNROTTEN][USE_BODY_COMPONENT][ANY_BONE_MATERIAL]
[REAGENT:
B5:1:NONE:NONE:CREATURE_MAT:HUMAN:BONE][UNROTTEN][USE_BODY_COMPONENT][ANY_BONE_MATERIAL]
[REAGENT:
B6:1:NONE:NONE:CREATURE_MAT:HUMAN:BONE][UNROTTEN][USE_BODY_COMPONENT][ANY_BONE_MATERIAL]
[PRODUCT:100:1:TOOL:ITEM_TOOL_DEAD:CREATURE_MAT:HUMAN:SKIN]
Or
[REACTION:DEAD_BOOK_ADV]
[NAME:Craft a book of Necropolis]
[ADVENTURE_MODE_ENABLED]
[REAGENT:BODY:4:NONE:NONE:CREATURE_MAT:HUMAN:SKIN][UNROTTEN][ANY_LEATHER_MATERIAL]
[REAGENT:B:6:NONE:NONE:CREATURE_MAT:HUMAN:BONE][UNROTTEN][USE_BODY_COMPONENT][ANY_BONE_MATERIAL]
[PRODUCT:100:1:TOOL:ITEM_TOOL_DEAD:CREATURE_MAT:HUMAN:SKIN]
That should make it workable or nicer, Either or
EDIT2: fixed a amount in the last reaction I said 7 instead of the normally required 6 bones
EDIT3: fixed a error that Kweri had pointed out, Thank you