Cr-Y-Sis

Bounty Hunter. Cr-Y-Sis deals double damage to members of the current party.

Spellcasting. Cr-Y-Sis is a 17th-level spellcaster. His spellcasting ability is INT (spell save DC 17, +18 to hit with spell attacks). Cr-Y-Sis has the following spells prepared:

Cantrips (at will): Disguise Self, Prestidigitation 

1st level (8 slots): Dissonant Whispers, Fog Cloud, Catapult, Hunter's Mark, Hideous Laughter, Magic Missile, Ray of Sickness, Snare

2nd level (6 slots): Alter Self, Invisibility, Blur,  Pass Without Trace, Misty Step, Spider Climb

3rd level (4 slots): Inflict Wounds, Acid Arrow, Haste, Major Image

4th level (2 slots): Counterspell, Wall of Fire

5th level (2 slots): Sleep, Contagion

Master Hunter. Cr-Y-Sis gets a +6 bonus to all Stealth, Survival, Investigation, Intimidation, History, and Deception checks involving any NPC or object the party has previously interacted with.

Hidden in Plain Sight. While in the same room as a party member, Cr-Y-Sis gets a +5 to Stealth checks.

Silvered Weapons. An assassin always comes prepared.

Multi-Attack. Cr-Y-Sis has many tricks up his sleeve as a bounty hunter. He can use his modified daggers twice to get the drop on unsuspecting party members, or use his dart gun to silently take down targets.

Dagger. Melee Weapon Attack: +17 to hit, reach 5 ft., 1 target. Hit: 25 (5d12 + 4) Piercing damage. 

Dart Gun. RangedWeapon Attack: +15 to hit, range 10/100 ft., 1 target. Hit: 10 (2d8+ 1) Piercing damage, and the target must succeed on a DC 20 Constitution save or be Poisoned, Paralyzed, Blinded, and Deafened for 1d4 rounds.

Slippery. When Cr-Y-Sis is subject to the Restrained Condition, he will automatically succeed any check necessary to escape.

Cr-Y-Sis is here to make the party pay for the Betrayal at the Mithral Forge. He will do whatever is necessary to destroy the party, or their associates.

Interrogate. When Cr-Y-Sis is in the same room as an NPC the party interacted with, he will wait until they all go to bed before making his next move. Have a player roll a D20, and on a 1-7, Cr-Y-Sis breaks the NPC down for all information on them and then kills them in a gruesome display, leaving a vague hint for the party. On a 8-15, Cr-Y-Sis breaks the NPC, leaving them hospitalized, their possessions broke, burnt, or smashed. On a 16-20, Cr-Y-Sis doesn't get the information, and is convinced the NPC doesn't know much about them and leaves them alone.

Always Watching. Cr-Y-Sis will always be a bit away from the party, but will make his move on isolated party members. He will taunt the party at every turn until killed.

Regroup. After the fall of the REX, Cr-Y-Sis stops following the party and stays by Kyzrex until the party decides to go back to the material plane at any point.