Grenades are part of the object class weapons. They are small, explosive projectiles that can be purchased in the Shop. To throw a grenade, first purchase one, enter a skirmish arena, aim your crosshair towards a monster, and press the "Throw Grenade" key. (default is G).
These are the current types of grenades:
Cyber Grenade Damage: 28 Cost: 80 Dynite