Warforged Viscera

Amorphous. The warforged viscera may use a bonus action to collapse its form into the gelatinous entrails it is animated from or to transform from that form into a huge humanoid, using scrap metal as armor and weapons. While in gelatinous form, the warforged viscera's speed is doubled and it becomes vulnerable to all damage, and it may move through a space as narrow as 1 inch wide without squeezing.

Gruesome Impersonation. As a bonus action, the warforged viscera can extrude a piece of itself that assumes the appearance of one Medium or smaller creature whose memories it has stolen. This simulacrum appears, feels, and sounds exactly like the creature it impersonates, though it smells faintly of oil. The warforged viscera can impersonate 2d6 + 1 different creatures, each one tethered to its body by a strand of slime that can extend up to 120 feet away (see Legendary Actions). Any simulacrum has 20 HP, an AC of 14, and operates on the warforged viscera's initiative count and can perform any regular combat actions, such as a grapple attack (using the ability scores of the warforged viscera minus 5) or the Help action. If a simulacrum is within 5 feet of the warforged viscera and the warforged viscera takes damage, it can choose to redirect all damage onto a simulacrum instead. The slimy tether is immune to damage, but it is severed if there is no opening at least 1 inch wide between the warforged viscera's main body and the simulacrum. The simulacrum disappears if the tether is severed.

Immutable Form. The warforged viscera is immune to any spell or effect that would alter its form.

Siege Monster. The warforged viscera deals double damage to objects and structures.

Warforged Resilience. The warforged viscera has advantage on saving throws against being poisoned, is immune to disease, and magic can't put him to sleep.

Multiattack. The warforged viscera makes two blade attacks and one hammer attack, or two pseudopod attacks.

Blade. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 21 (4d6 + 7) slashing damage, plus 9 (3d6) slashing damage if the target is prone.

Hammer. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 21 (4d6 + 7) bludgeoning damage. If the target is a creature, it must succeed on a DC 17 Strength saving throw or be knocked prone.

Pseudopod (Ooze form only). Melee Weapon Attack: +11 to hit, reach 30 ft., one target. Hit: 21 (4d6 + 7) bludgeoning damage.

The warforged viscera can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. The warforged viscera regains spent legendary actions at the start of its turn.

Disengage. The warforged viscera may change forms and move up to its speed without provoking opportunity attacks.

Produce Simulacrum. Anywhere from 1-4 simulacra are produced, appearing anywhere around the warforged viscera in a 30 foot radius. For each simulacra produced, the warforged viscera takes 15 points of damage.

Engorge (Costs 2 Actions). The warforged viscera attempts to engorge a creature, making a grapple attack contested by the creature's Strength. If the creature fails, it is restrained. The creature may use an action to break free by contesting a Strength check. At the end of the creature's turn if it still engorged, the creature takes 32 (6d10) acid damage. There can be a maximum of 4 alive creatures engorged by the Warforged Viscera.