Lightning Burst

Melee or Ranged Spell Attack: +5 to hit, reach 5 ft. or range 60 ft., one target. Hit: 17 (4d6 + 3) lightning damage, and each creature, other than the target, within 10 feet of the target must make a DC 13 Dexterity saving throw, taking 7 (2d6) lightning damage on a failed save, or half as much damage on a successful one.

Invisibility

The spire walker magically turns invisible until it attacks or until its concentration ends (as if concentrating on a spell). Any equipment the spire walker wears or carries is invisible with it.