Energy Battery [VOW]

Vow Feat

You can accumulate a part of your energy in an object that will become your battery. This battery can handle up to double your maximum amount of Energy, but it can only be charged once per day at the beginning of the day, when you can send an amount of Energy up to your Intelligence modifier + your proficiency bonus. Any Energy that you send into the battery cannot be replenished until the next day. After the battery has reached its Energy limit or at least half of it, you can use it as you wish, from fuel to any machine or to replenish your Energy. You can draw the Cursed Energy from inside the battery as a Bonus Action, taking any number of Energy you wish. This cannot exceed your maximum with this extraction.

Note: Energy can be classified as Ki Points, Spell Slots, Sorcery Points, Hemocraft, Warlock Slots and Psionic Points

(Half Casting Points do not get affected)

(Spell Slots can only be the same type per Battery)

(Hemocraft cannot be stored in similar spellcasting focuses or Blood containers)

(Warlock slots in the battery can be attuned to, as to not be lowered but be regained after a long rest)

You can take this vow multiple times for more batteries.