40 Thieves. Cassim starts combat with 40 "Thief" stacks. Cassim may spend stacks of Thief to activate special abilities that would normally be limited to actions, bonus actions, or legendary actions, as reactions instead. Cassim regains spent stacks of Thief at the end of the round, with the number being gained resulting from a 1d8+2. Cassim also starts combat with 4 Thieves summoned to their side
Thief Technique: Dogpile. After hitting and damaging a target with a melee attack, Cassim may spend up to 3 stacks of Thief to deal 1d6 magical piercing damage to the target per stack spent
Body of Sand. Cassim has advantage against grapple checks and can squeeze through openings as small as 1 inch
Spellcasting. Cassim is a 10th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 15, +7 to hit with spell attacks). Cassim has the following wizard spells prepared:
Cantrips (at will): Lightning Lure, Mold Earth, Thunderclap
1st level (4 slots): Earth Tremor, Fog Cloud, Witch Bolt, Tasha's Hideous Laughter
2nd level (3 slots): Blindness/Deafness, Dust Devil, Maximilian's Earthen Grasp
3rd level (3 slots): Ashardalon's Stride, Lightning Bolt, Wall of Sand
4th level (3 slots): Black Tentacles, Storm Sphere
5th level (2 slots): Telekinesis, Bigby's Hand
Multiattack. Cassim attacks twice with its shortsword.
Shortsword+1. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 4) piercing damage plus 10 (3d6) lightning damage
Cunning Action. On each of its turns, Cassim can use a bonus action to take the Dash or Disengage action
Cassim can use 3 reactions per round, but only 1 of them can be used for opportunity attacks
Thief Technique: Switch. Cassim spends Thief stacks equal to the current total of allies on the field to swap places with 1 ally within 60ft
Thief Technique: Sand Trick. Cassim spends Thief stacks equal to the level of a spell that they wish to cast with cantrips and first level spells both using 1 stack. The spell that is selected must have a casting time of 1 action. If Cassim has no allies, the Thief cost is doubled
Thief Technique: Body Double. Cassim spends Thief stacks to reduce an incoming source of damage from an attack by a creature within 5ft. The amount of damage reduction is based on 1d6 per Thief stack spent, with a maximum of 5 stacks being spent per activation of this ability
This creature has 2 uses of legendary resistance
1- Thief Technique: Trap. Cassim spends 1 Thief stack to place a trap on an unoccupied tile. This trap activates when an enemy steps on it, launching sand over them and forcing them to make a DC 12 Strength saving throw against being grappled. While the trap can only be removed if disarmed, dispelled, or triggered, the grapple effect only lasts until the end of Cassims next turn
2- Thief Technique: Sacrifice. Cassim kills 1 ally on the field to replenish 1d4+1 Thief stacks
3- Thief Technique: Replenish. Cassim spends Thief stacks equal double the number of allies on the field to respawn and replenish the HP and reactions of all allies
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