Huge construct, unaligned

Armor Class: 16 (natural armor)

Hit Points: 81 (9d10+32) 9d10+32

Speed: 30 ft , fly: 0 ft , burrow: 0 ft , swim: 0 ft , climb: 0 ft

STR

24 +7

DEX

12 +1

CON

22 +6

INT

3 -4

WIS

11 +0

CHA

1 -5

Damage Resistances: fire

Damage Immunities: poison, psychic

Condition Immunities: charmed, exhaustion, frightened, paralyzed, petrified, poisoned

Senses: blindsight 20ft, darkvision 120ft, passive Perception 10

Challenge Rating: 11 ( 7200 XP)

Proficiency Bonus: +4

Actions

Multiattack. Sentron makes six scimitar attacks or three slam attacks.   Scimitar. Melee weapon attack: +11 1d20+11 to hit, reach 10ft, one target. Hit: 14 (2d6+7) 2d6+7 slashing damage.   Slam. Melee Weapon Attack: +11 1d20+11 to hit, reach 10ft, one target. Hit: 21 (3d8+7) 3d8+7 bludgeoning damage.

Legendary Actions

Setron can take 1 legendary action, choosing from the list below. Only one legenday action can be used at a time and only at the end of another creature’s turn. Setron regains spent legendary actions at the start of its turn.   Summon Simbims. Sentron summons 0 (1d4-2) [roll:1d4-2} Simbims into any unoccupied spaces within 80ft of itself that it can see.   Flurry Rush. Sentron moves up to half of its movement in any, straight direction, making a scimitar attack against any creature that enters its range. The number of attacks it may take is equal to the number of arms it has remaining.

Lair Actions

Temfala Tower. Sentron's boss arena will contain six pillars situated around the edges of the room. If any one of Sentron's attacks make contact with one of said pillars, the pillar will crumble to the ground, potentially crushing any creatures caught underneath. All creatures within 10ft of a collapsing pillar must succeed on a DC 15 Dexterity saving throw or take 22 (4d10) 4d10 bludgeoning damage, halved on a success.