The Machinist LB4 should be a Turret.

A aspect about Machinist you will notice is that the theme of Machinist's turrets are based on Chess pieces. There is Rook for the single target range Turret, Bishop for AoE turret, and I believe Queen for LB3 Turret.

LB4 can be Pawns where the Machinist summon 8 Turrets that fire a all out attack on the Range LB Area.