Fatman

The  is a Custom Shape that upgrades from Custom Shapes.

Design
It looks like the Fat Man nuke launcher from the Fallout series.

Technical
The fires nukes that slow down kind of like Traps and explode similar to the Shrapnel branch's nukes. However, they also explode into many shards that look like the shards produced by Crockett's nukes, but unlike the Crockett these nukes explode into many scattered shards more akin to the explosion of RPG.