4th and final ability are his rumblers. He summons 2 massive rock golems who will run around drawing aggro and punching enemies in the face. They come with 1200 health and 500 armour and do 2000 impact damage per hit, all of which can be increased using strength mods, so they can have some absolutely crazy health when modded. When you cast the ability, atlas will petrify everything in a 6 metre radius, so if a sneaky butcher tries to hit him during the cast, they'll get frozen, which is pretty sweet, You can recast the ability too which will cause the rumblers to explode dealing 1250 blase damage over 6 metres and dropping one piece of rubble each. Casting and recasting these during downtimes to refresh your armour, boosting it and stopping the timer can be a very good way of using the recastability.

Titanic Rumblers the augment for this ability. It trades the 2 rumblers and the recastability for one giant rumbler with a taunt that will pull all aggro off of you. If you recast the ability, the rumbler will do a ground slam and pull enemy aggro off of atlas, protecting him. That taunt has a 6 second cooldown so it can't be spammed at all. Personally I'm not a fan of this augment, losing the recastability is something I don't like because I use that to replenish my health and armour in between waves. However its not a terrible augment. If you like using a more ranged atlas build, using the huge rumbler to draw aggro from you, while using your wall to hide behind and using petrify for crowd control can be pretty effective. I personally don't build around it, but I don't think its a waste of a modslot at all.