Nether Drain

Spell — Debuff • Cost: 1

One hero loses two levels and can't level up this turn. Another hero gains two levels. (Heroes can't go below level 1 or above their max level.)

Black • Necromancy Magic

Card-Specific Rulings

It doesn't matter if you control the heroes this this targets or not. It works on your own heroes and/or opposing heroes. — Sirlin, 03/02/16

If you level up another player's hero and an ability that triggers from that requires another player to make a decision on your turn, instead that ability fizzles. For example, if you level up an opposing Necromancy hero to max level on YOUR turn, then its controller doesn't get to search their discard pile for a unit costing 5 or less. — Sirlin, 03/02/16