Boon of Fluid Forms
Epic Boon Feat (Prerequisite: Level 19+)
You gain the following benefits.
Ability Score Increase. Increase Intelligence, Wisdom, or Charisma by 1, to a maximum of 30.
Eternal Rest. Creatures you reduce to 0 Hit Points can't become Undead.
Shapechanger. You can take a Magic action to shape-shift into a Beast, Humanoid, or Monstrosity with a Challenge Rating no higher than 10. When you shape-shift, you gain a number of Temporary Hit Points equal to the Hit Points of the form. The shape-shifting effect lasts for 1 hour, and it ends early if you have no Temporary Hit Points left or if you take a Magic action to return to your true form.
Your game statistics are replaced by the stat block of the chosen form, but you retain your creature type; alignment; personality; Intelligence, Wisdom, and Charisma cores; Hit Points; Hit Point Dice; and ability to communicate. If you have the spellcasting or Pact Magic feature, you retain it too. Upon shape-shifting, you determine whether your equipment drops to the ground or changes in size and shape to fit the new form while you're in it.
Hardy Transformation. When you gain Temporary Hit Points when you shape-shift, increase that number of Temporary Hit Points by 20.