An Orb is an entity that is moved by force. An Orb has a theme, which determinates it's main purpose. An Orb has an array of stats which describe it's power. It can load modules to activate them with energy.
Orbs can be controlled by player or are controlled by the game engine's artifical intelligence. Normal AI orbs can be bosses or minion orbs. Bosses have the ability to spawn minions.
There are some special types of orbs: