Item already has a mod of this type?

I want to craft % Increased Chaos Damage prefix onto this weapon, which has a free prefix, but the crafting bench tells me the item already has a mod of this type.



For clarity:
Implicit - 34% Spell damage
Prefix 1 - (Lava Caller's) +2 to Socketed Fire Skills
Prefix 2 - (Tacati's) 72% Spell damage & 5% non-Chaos as extra Chaos
Suffix 1 - (of Prestidigitation) 18% Cast Speed
Suffix 2 - (of Impact) 14% Increased Stun Duration

Can anyone tell me which prefix is the conflicting prefix? I know that a % Increased Fire/Cold/Lightning Damage prefix conflicts, but I don't know of any others (or where to see which ones conflict with which others).

It's the Tacati's spell damage mod that conflicts. The normal spell damage prefixes (glyphic/etc) are also in the same family as % increased lightning/cold/fire/chaos.

http://poedb.tw/us/mod.php?cn=Wand shows this fairly well, but doesn't show conflicts across different types of mod. You can generally intuit most of the rest of it, though.

Where can I find weapons with Tacati's prefix? Only in the temple or also during Alva's incursions?

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Caligula_Exile написал:

Where can I find weapons with Tacati's prefix? Only in the temple or also during Alva's incursions?

Temple of atzoatl but some legion monsters also drop them. Not sure if you can get the in delve too.

Mod groups are the reason you can't craft that prefix. Only 1 mod allowed from each mod group. You can't see this ingame. You have to check poedb or the wiki.

https://pathofexile.gamepedia.com/Modifiers#Mod_Group