Forge version: 14.23.2.2629
incontrol! version: 1.12-3.7.1

spawn.json
loot.json

I'm using PrimalCore 1.12.2-0.6.41 for my armored zombie . They wear their armor but they still drop them...

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Questions

Could you give me an example of "helditem" with metadata and NBT ? (maybe i make something wrong but it won't work when i've tryed)

Could you tell me how to change "helditem" for offhand ? Is it possible ?

From the wiki:

Note, everywhere in the rules below that you can specify items you can use the following notations:

minecraft:sand (just normal minecraft sand)
minecraft:stained_hardened_clay@13 (adds metadata 13)
With NBT (same format as for /give command): minecraft:stained_hardened_clay@13/{display:{Lore:["My Clay"]}}