Tank mech - codename "Fortress" (all the stats shown are at max level)

Energy capacity - 24, or, 32

HP - At least higher than Bastion

Ability - "Entrench" - Prevents the "Fortress" from moving and greatly reduces turning speed, but applies a passive "Damage reduction of (80% - 90%) for ALL incoming Damage"

Ability cooldown - The Ability can be toggled, ON or OFF, after a (5 - 7) second cooldown. the ability takes    (1 - 2) seconds to fully engage or disengage, durring this time the user cannot do anything but the Fortress can't take damage. The ability will not turn off by itself, it must be disengaged by the user or an opposing Gardian

"An Impenetrable Fortress that is nigh Impossible to kill"

Comment if you want more mech or weppon ideas (I have a lot)