Wendigo's Wrath

A spell once the favorite of wood elf mages, has now been forgotten by all but the oldest wizards.  Remembered and passed down from master to student, this spell can only be used by the those of strong will and mastery of their art.  Upon casting, you summon a Wendigo forest spirit at a point you can see within 90ft.  The enraged spirit attacks everything in a  30ft circle from the point of summon with a flurry of claws and teeth dripping with a thick, viscous acid that seeps from deep inside its body.  All creatures in the area must make a Dexterity saving throw of 15 or take 3d8 acid damage.  Creatures take half damage on a successful save.

Using a Higher-Level Spell Slot. The damage increases by 1d8 and the Dexterity Save increases by 2 for each spell slot level above 1. When casting this spell at higher levels, the Wendigo spirit is larger and more enraged, representing the additional damage dealt.

Spell Mastery:  When this spell is cast at 9th level, the caster rolls a wisdom check, on a roll of 20 or more, you summon 2 Wendigo spirits dealing double the spells damage roll.