The wonder weapon
The DRI-11 Beamsmasher is the wonder weapon of Terminus and its debut. Its primary fire is a constant energy beam; its second mode sends a sonic pulse that slows every zombie it touches, bosses included, and leaves them open to any damage. Emptying the magazine releases a shockwave. It holds 80 shots, 120 once upgraded.

DRI-11 Beamsmasher
An unsanctioned side project of Anya Tonovsky, inspired by the Wunderwaffe DG-2 and powered by a miniature Aether reactor. At the Pack-a-Punch it becomes the Supersonic Crusher.
It comes from the Mystery Box for 950 Essence, or for free through the quest below, which needs the power of the whole island. It is also required for the first step of the main quest.
