Multiattack. The mech can make two attacks

Force beam. d20+5 to hit, 2d12 force damage, 150ft line

Light nuke. d20+8 to hit, dex save dc 15, 3d20+5 radiant damage, 50ft sphere range range 500ft

Xenon flamethrower. d20 to hit, 8d4 fire damage, 60ft cone

lightning wave. d20+2 to hit, 40 ft wave of 3d6 lightning damage, range 50ft.

 Lock on. The mech locks on to a target, and uses its reaction to move with the target. Range 100ft.

Rocket dash. The mech move up to 50ft this can only be used when locked onto a target.

Quantum destruction beam. d20+5 to hit 500ft range 3d20 radiant damage in a 20ft sphere

Reinforcements. Calls over all remaining X units and prepares a team attack if X2-3 are destroyed it uses 5 quantum destruction beams if X1 is dead it uses all 4 actions and if X1 X2-3 are both alive then it does both parts of this attack.

Overcharge. 1 charge activates legendary actions