Blighting Jewel: TFT Set 18 artifact
Blighting Jewel is an artifact in TFT Set 18. On our item tier list it is A tier. Magic shred for Cassiopeia.
What Blighting Jewel does
Dealing magic damage reduces the target's Magic Resist by 6. If their Magic Resist is 0, grant the holder 2 Mana instead. Ability damage can only trigger on each enemy once every 0.5 seconds.
From Riot's game data; the exact numbers can change between patches.
See where Blighting Jewel sits against every other item on the item tier list.