GTW-16 Helix - The Helix is essentially a supersized rotating cannon equipped with eight GTW-5 Prometheus (Standard) or GTW-5a Prometheus (Retrofit) Cannons. When the fire button is pressed, the Helix discharges eight bolts of the equipped Prometheus Cannon - one from each - before rotating 1/16 clockwise while the guns recharge. When the fire button is held down, the Helix releases a spiral barrage of Prometheus Cannons at the same rate as a single Prometheus (Standard) Cannon. This makes the Helix Cannon very powerful - even more so than the GTW UD-8 Kayser. However, it also draws huge amounts of energy from the player's ship, equivalent to the combined energy drain of all Prometheus cannons equipped to it. In the event where the player is allowed to equip more than one primary weapon, it is advisable to either switch to single-fire mode, or use only this as a primary weapon, leaving the other mount empty.