You can use an action to command this bone to grow into a human skeleton on command (use the stats of a Skeleton). The skeleton understands and obeys you, but cannot speak, even if a speak with dead spell is cast upon it. If you give it a weapon, it fights for you on command. The skeleton can be damaged by any sort of weapon and disappears if "slain," resuming its original bone form. It can carry up to 100 pounds weight. If it is the target of a turn undead abilty, the skeleton disappears, replaced by the original bone for 1d4+2 rounds; the skeleton then reappears and resumes its previous activity. A dispel magic spell automatically causes the skeleton to stop, paralzyed, for 1d4+2 rounds. You can use the bone of animation to create a skeleton once per day, and the creature will serve you for one hour or until slain or dismissed by you back into bone form.

Adapted from The Book of Marvelous Magic.

Image generated with Stable Diffusion.

Notes: Summoning