b'Vengeful Sentry \n'b'  Medium   undead ,  lawful neutral\n'b' STATS STR: 17 (+3) DEX:  15 (+2)  CON:  16 (+3)  INT:  12 (+1)  WIS:  14 (+2)  CHA:  10 (+0)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'     Armor Class  15 (natural armor)  Hit Points  120 (16d8 + 48)  Speed  30 ft., fly 50 ft.  Damage Vulnerabilities  radiant  Damage Resistances  necrotic; bludgeoning, piercing, and slashing from nonmagical attacks  Damage Immunities  poison  Condition Immunities   charmed ,  exhaustion ,  frightened ,  paralyzed ,  poisoned , stunned, unconscious  Senses   darkvision  120 ft., passive  Perception  12  Languages  Dwarvish, Ledean  Challenge  7 (2,900 XP) \n'b' Special Traits \n'b'   Avoidance . If the vengeful sentry is subjected to an effect that allows it to make a saving throw to take only half damage, it instead takes no damage if it succeeds on the saving throw, and only half damage if it fails. \n'b'  Rejuvenation . When the vengeful sentry is defeated, it is not truly destroyed. After one week, the vengeful sentry reforms at Irontooth Pass in the Kelder Mountains and regains all its  hit points . Before it reforms, a  wish  spell can be used to force the sentry permanently into the afterlife. \n'b'  Shadow Stealth . While in dim light or darkness, the vengeful sentry can take the  Hide  action as a bonus action. \n'b'  Swarm Form (Recharge 4-6) . The vengeful sentry uses a bonus action and takes the form of a shadowy swarm of crows, rapidly shifting and moving, causing attack rolls against it to have disadvantage. It returns to its normal form at the beginning of its next turn. \n'b'  Undead Nature . A vengeful sentry doesn\xe2\x80\x99t require air, food, drink, or sleep. \n'b'  Actions \n'b'   Multiattack . The vengeful sentry makes three slam attacks. \n'b'  Slam .  Melee Weapon Attack : +6 to hit, reach 10 ft., one creature.  Hit : 6 (1d6 + 3) piercing damage plus 10 (2d6 + 3) necrotic damage. \n'b'  Tactics \n'b' The vengeful sentry will choose a combat location that makes good use of its ability to hide in shadows and fly. It then begins to harass the party, taking its time and being willing to retreat if necessary, only to return once it has a tactical advantage. Once it has marked outsiders for death, it is relentless. \n'b' Watchful crows are always found wherever the vengeful sentry resides. The vengeful sentry can even assume the shape of a shadowy mass of crows while flying and even during combat. \n'b' Description \n'b' The vengeful sentry appears as dwarf shrouded in black, with a visage entirely  obscured  in shadow. Its appearance is most often preceded by a gathering of crows. Those who draw near the quietly perched birds find that they begin to caw more and more loudly, until they take wing and circle in agitated patterns around the unwanted visitors, heralding the arrival of the sentry, who silently steps into view from a nearby shadow.'