The mech is available as part of the Rift Walkers squad. It is their prime mech.
This mech is the Rift walkers tank. As such, it should be fighting in the front lines dealing damage while being given support by artillery. However, if this is in a custom squad, it's pushing ability may help for other prime mechs to hit that vek again. This (in my opinion) is one of the best mechs in the game, as it can deal 2-4 points of damage, depending how much it has been upgraded. Also, it has knockback, and dashing ability. If this is in the Rift walkers squad, it is wise to increase movement and damage. However, in a custom squad, you may have to do different adaptions. The dash ability is expendable. Keep it if you can't get another (ranged) weapon, otherwise use that two power for something better. This mech is also very versatile. The best pilot for this mech is Gana, but most pilots will work.
-This is the first prime mech you get in the game.