Mel

Passive: While gaining Mana, throw out 2/2/9 radiant orbs that orbit around target. They deal X magic damage in a 1 hex radius and drain 1 Mana from enemies hit each second. After draining 215/215/10 mana, gain a random Radiant Item. (X/215/215/10)

Active: Detonate orbs on target, causing a 3 hex radius explosion that deals 1000/1500/10000 magic damage to them and X damage to all other enemies hit.

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