Forbidden Idol: TFT Set 18 artifact
Forbidden Idol is an artifact in TFT Set 18. On our item tier list it is C tier. Niche shielding; rarely worth a slot.
What Forbidden Idol does
Shields have 50% of their value converted to max Health instead.
From Riot's game data; the exact numbers can change between patches.
See where Forbidden Idol sits against every other item on the item tier list.