Undine's dance

You flourish the ring, and call out to Undine to summon this spirt of water. She glides across the field healing her allies or cutting her foes. You can choose up to three creatures you can see within range. Make a melee spell attack against each target. On a hit, a target takes 1d6 cold damage or you can expend it to heal 1d6 hit points. Undine can not do both healing and damage at the same time

At Higher Levels. The spell damage goes up 1d6 for every 1 spell lvl it goes up ie casting it at lvl 2 will be 2d6 damage, or healing and casting at lvl 4 will be 4d6 damage or healing.

for every 2 lvls you up casting at beyond lvl 1 it adds an additional target ie casting at lvl 3 is 4 targets and casting at lvl 5 is 5 targets