Lightning Form. The elemental can enter a hostile creature's space and stop there. Any creature that occupies the same space as the elemental at the end of its turn takes 1d10 lightning damage. The elemental can move through a space as narrow as 1 inch wide without squeezing. The elemental casts bright light in a 10ft radius, and dim light for an addtional 10ft.

Multiattack. The elemental makes two Arc Bolt attacks.

Arc Bolt. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit:  (2d10+ 5) lightning damage. This attack is made at advantage if the target is weraing armor made of metal. 

Fury of the Storm (Recharge 3-6). As an action, the elemental can choose to cast either Lightning Bolt, Storm Sphere, Thunderwave or Thunder Step, as a 6th level spell. Wisdom is the spellcasting modifier for these spells.