Giant Centipede | Necrotic Centipede

Necrotic Centipede BGDIAp119  Huge Monstrosity, UnalignedAC 17 (natural armor) Initiative +1 (11) HP 195 (17d12 + 85)Speed 30 ft., Burrow 20 ft.  modsave   modsave   modsaveStr24+7+7 Dex13+1+1 Con21+5+5Int4-3-3 Wis10+0+0 Cha5-3-3Immunities Necrotic, FireSenses Darkvision 60 ft., Tremorsense 60 ft., Passive Perception 10Languages —CR 11 (XP 7,200; PB +4)Traits Necrotic Body. A creature that touches the centipede or hits it with a melee attack while within 5 feet of it takes 10 (3d6) necrotic damage.Actions Bite. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 40 (6d10 + 7) piercing damage plus 10 (3d6) necrotic damage. If the target is a creature, it is grappled (escape DC 17). Until this grapple ends, the target is restrained, and the centipede can't bite another target. Swallow. The centipede makes one bite attack against a Medium or smaller creature it is grappling. If the attack hits, that creature takes the bite's damage and is swallowed, and the grapple ends. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the centipede, and it takes 21 (6d6) acid damage at the start of each of the centipede's turns. If the centipede takes 30 damage or more on a single turn from a creature inside it, the centipede must succeed on a DC 15 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the centipede. If the centipede dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 15 feet of movement, exiting prone.  Source: BGDIA, page 119