Demorph Anjanath

You cast de-evolving magic on a grappled or restrained fulgur anjanath that has lost at least 20 hit points you can see and hear within range. The fulgur anjanath must succeed on a Wisdom saving throw or be transformed into a normal anjanath.

The spell's effects last until a greater restoration spell or similar effect is cast on the transformed anjanath, which will result in it transforming back into its original form but retaining the amount of hit points it had before being re-transformed.