Bag of Slime

This sinister bag made of the skin of a terrible monstrosity, appears empty. Reaching inside the bag, however, reveals the presence of a small, slimy object. The bag weighs 1/2 pound.

You can use an action feed your life forced into the bag and expend 1 hit dice, allowing you to pull the slimy object from the bag and throw it up to 20 feet. When the object lands, it transforms into a creature you determine by rolling a d8 and consulting the table below. 

The creature is friendly to you and your companions, and it acts on your turn. You can use a bonus action to command how the creature moves and what action it takes on its next turn, or to give it general orders, such as to attack your enemies. In the absence of such orders, the creature acts in a fashion appropriate to its nature. The ooze loses form and collapses after 1 hour or when it is reduced to 0 hit points. Its remains then slink away, no longer obedient to your commands. 

You are reduced to 0 hit points if you try to feed the bag your life force but have no remaining hit dice and gain one 1 level of exhaustion.

Notes: warlock, Summoning, Utility