Mod upgrades: Thumper Lvl 1 - Tick dmg turret Lvl 7 - Prots from thumper Lvl 14 This build allows you to let your familiars (turrets) do the damage which give you the ability to focus on your positioning. Use the Thumper to create space between you and the opponents while you place your turret near you for the HP and protections late. Another great aspect (pun intended) is that you are able to solo GF and Pyro at level 7.
When the team has a lot of healing or you're going against a heavy healer.