Bones in the Sewers (BITS) CR 8

Osseocasting Mastery. BITS magically reshapes his skeleton at will. His weapon attacks are magical. He does not require verbal components for his spells or abilities.

Skeleton Physiology. BITS can detach, rearrange, or duplicate parts of his skeleton harmlessly. 

Guildmark Resonance. While within 30 feet of an allied creature, BITS has advantage on saving throws against being charmed or frightened.

Reassemble (1/Day). When reduced to 0 hit points, BITS collapses into scattered bones instead of falling unconscious. At the start of his next turn, he reassembles with 30 hit points unless radiant damage reduced him to 0 hit points.

Multiattack. BITS makes two attacks: either two Reform Strikes or one Reform Strike and one Spine Lash.

Reform Strike (Bone Fist) Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 7) bludgeoning damage.

Spine Lash. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (4d6 + 7) slashing damage, and the target must succeed on a DC 15 Strength saving throw or be pulled up to 10 feet toward BITS.

Bone Cannon Arm (Recharge 4–6)  Ranged Spell Attack: +7 to hit, range 60 ft., one target. Hit: 27 (6d8) force damage. BITS forms his arm into a reinforced bone launcher.

Spellcasting BITS’s spellcasting ability is CON (spell save DC 16, +7 to hit with spell attacks).

At Will: Mage Hand, Mold Earth 

4/Day Each: Grease, Earth Tremor

3/Day Each: Blur, Enlarge/Reduce, Maximilian’s Earthen Grasp 

2/Day: Animate Dead (Restricted Use). BITS targets only himself or creates one Small skeletal construct that crumbles after 1 minute. When used on himself, he gains 20 temporary hit points instead of animating a creature.

Rib Shield. BITS grants himself or one creature within 10 feet a +3 bonus to AC until the start of his next turn. 

Scatter Step.  BITS magically disassembles and reforms in an unoccupied space within 20 feet. This movement does not provoke opportunity attacks.