Fusion Cannon

Fusion Cannon is a powerful Rocket Launcher that slows the player when wielded.

The primary fire creates a stationary orb of power a small distance away from the player. After a few moments, the orb flys away in the direction the Fusion Cannon was originally pointed when fired. If an enemy is encountered, the orb explodes for damage. If the orb does not immediately encounter an enemy, it will break blocks in a 3-block radius around itself as it travels almost a full screen distance away.

The secondary fire is a "Fusion Flame" which rapidly generates damaging gas clouds to a medium distance. These clouds do not deal much damage, but do provide a measure of knockback.

Upgrade
When upgraded to tier 6 (via the Personal Tricorder), a Fusion Cannon gets upgraded into Blastmark, which is even more destructive.