Elemental Blessing Rune (5e Spell)
From D&D Wiki
|Casting time:||1 action|
|Components:||V, S, M (stone with an elemental rune on it or drawing the symbol of the rune in sand/air)|
|Duration:||1 minute, Concentration|
You choose a willing creature within range and bless them with an elemental rune. You choose a damage type from fire, cold, thunder, acid, lightning, or poison and grant the creature immunity to all damage of that type for the duration of the spell.
In addition, the affected creature deals an 1d4 damage of the selected damage type with successful melee attacks.
At Higher Levels. When you cast this spell using a spell slot of 6th level or 8th it increases the damage by 2d4 and then 3d4 and the rounds last an extra +2 or even +4. Only at 8th level can the Elemental energy be changed at will and it takes one turn to change.