Thresh

Passive: Each second, deal X magic damage to all enemies within 2 hexes. Heal for 75% of the damage dealt by this effect.

Active: Create a prison of walls in a 2 hex radius that lasts 5/5/60 seconds. While active, the Passive's damage is doubled. When an enemy touches a wall, they take X magic damage. If there are less than 2 enemies inside The Box at any time, drag an enemy in.

Exact values aren't in Riot's published Set 16 data (shown as X).