Heat Ray

The Heat Ray is a magic weapon dropped by the Golem Boss. It is a direct upgrade to the Laser Rifle, firing a hitscan laser beam which pierces through an unlimited number of enemies. It is similar to the Shadowbeam Staff - but unlike the Staff, the Heat Ray's laser does not bounce off walls. The laser also gives off light, which can be handy for finding your target in dark areas.

Tips
EDIT: UPDATED uses 6 mana per shot !
 * The Heat Ray pairs extremely well with the Spectre Armor. It costs 0 mana to fire, and still grants you the healing provided by the armor's set bonus. With the right buffs, it can provide a fairly decent DPS with enough healing to not have to worry about significant HP loss.