Cleave

Cleave is the second slashing attack that adjusts its power depending on the target's toughness and Mana level to cut them down with one attack
On a hit, the target takes 2d6 slashing damage, and it can’t make Opportunity Attacks until the start of its next turn.

Cantrip Upgrade. The damage increases by 1d8 when you reach levels 5 (2d8), 11 (3d8), and 17 (4d8).