Envelopmental

Created by high elf cleric, Tenya Silinal, she originally designed the spell to trap undead in place. The spell has evolved over time; the most common use now is as a defensive spell against elemental creatures.

A glowing orb of light forms and spins around the targeted creature, and if the creature has an elemental or undead nature, it is restrained for the duration of the spell (concentration) and must succeed on a WIS saving throw to free itself. Non-undead or elemental creatures are slowed and all movement is as though it is through difficult terrain. If the spell is successfully cast on an elemental creature, the caster can choose to transform the creature into an elemental creature of the same type but representing a different element (i.e. Air Elemental changed into an Earth Elemental, Ice Mephit changed into Dust Mephit). On a subsequent turn, the caster can use a bonus action to roll a saving throw using their spellcasting ability. If successful, the caster can drastically alter the temperature within the orb. - Whipstache