Star Matter

 is one of the many Consumables in For The King.

Description
 is a one-time use consumable that creates a Group Shield (The game doesn't give it a name, but the code calls it a GroupShield) on every member of the party. The Group Shield can take three hits collectively across the party (I'll research into this further, It might be the number of party members).

Acquired
Will drop from any fight where the Black Hole skill was activated. (I do not know if multiple activations of Black Hole will cause multiple to appear)