Large Guardian Automaton

Antimagic Susceptibility. The armor is incapacitated while in the area of an antimagic field. If targeted by dispel magic, the armor must succeed on a Constitution saving throw against the caster's spell save DC or fall unconscious for 1 minute.

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Weighted Frame - Advantage on athletics checks.

Magic Soul -  All the Construct's attacks are counted as Magical damage 

Grapple Matrix - The Heavy Automaton can use grapple as a bonus action.

Large Constructs gain 5*Intelligence Modifier of caster in HP; Gains additional 1d8 on damage rolls

AC 12 + Constitution Bonus + Intelligence Modifier of caster

HP = 1d12 per caster level plus intelligence plus PB

Multiattack - The Heavy Automaton makes two slam attacks per turn

Slam Attack - Attack roll - Spell attack modifier of caster; Damage roll - 2d6 + spell attack modifier of caster on successful hit, the target must make a athletics saving throw with a DC of 11 + spell attack modifier of caster