Storm Skin (5e Spell)
From D&D Wiki
|Casting time:||1 action|
|Duration:||Concentration up to 1 minute.|
You surround yourself in an invisible field of electricity shocking any would-be attackers.--> Whenever a creature hits you with a melee weapon the attacker takes 1d4 lightning damage. After 4 hits the spell ends.
At Higher Levels. When you cast this spell using a spell slot of 3rd or higher the damage die increases by 1d4.