Risk of Rain 2 heresy items tie to Kur-skan the Heretic in item logs. This page splits log quotes from fan theory so the unlocks stay honest.
Risk of Rain 2 heresy items almost always search next to Heretic / Kur-skan. The source does not give the four-piece official English names or numbers. It does include a long item-log reading: Providence shattered Kur-skan, her body parts became items, and collecting them lets survivors operate her body.
Keep two layers. Layer one is log paraphrase. Layer two is the video author's speculation. Only layer one is treated as "appeared in the source." Layer two stays unverified.
What the logs say about the body
The video quotes logs: Kur-skan was gutted; arms twisted into blades so she could no longer take joy in tools; legs scattered to the lunar poles in an obsidian thorn field; a heart too hateful stayed where she stood and watched the betrayal. The viscera logs start at volume three, with volumes one and two missing. The author wonders if later DLC will add more Kur-skan items.
The same logs mention betrayal. The author offers two readings: Kur-skan betrayed Providence to serve Mithrix, or later tried to flee Mithrix. Those causal stories are speculation. What belongs in the article is only that the game ties Heresy to lunar, Mithrix, and Providence.
What you see in a run
The source says survivors assemble the broken parts and control the body; the operator is the survivor, not Kur-skan herself. The evidence cited is Mithrix asking who is puppeting the Heretic. If you escape Petrichor V in that form, a line about leaving with bitter revenge and deep loss appears; if you fail to escape in time, two stories become one. How many pieces, which stages, and whether they replace skill slots stay unverified.
This page is not a cheat guide. Heresy is also not Hallowed Concepts Hex, which is an unreleased pure-downside type.