Disintegration. If the magen dies, it disintegrates into dust, leaving behind anything it was wearing or carrying.
Magic Resistance. The magen has Advantage on saving throws against spells and other magical effects.
Multiattack. The magen makes two attacks, using Extended Fist or Acid Spittle in any combination.
Extended Fist. Melee Attack Roll: +6, reach 15 ft. Hit:8 (1d8 + 4) Bludgeoning damage plus 5 (1d10) Acid damage. If the target is a Medium or smaller creature, it has the Grappled condition (escape DC 14) from one of two fists.
Acid Spittle. Ranged Attack Roll: +6, range 60 ft. Hit:13 (2d8 + 4) Acid damage.
Caldron magen are powerful bodyguards that stretch their limbs and spit acid in defense of those they protect.