Armor Class 12
Hit Points 117 (18d8 + 36)
Speed 30 ft.
Saving Throws INT +10, WIS +7
Skills Arcana +15, History +15, Investigation +10, Religion +10
Damage Resistances [object Object], [object Object]
Senses passive Perception 12
Languages Celestial, Common, Draconic, Elvish, Infernal, Primordial
Challenge 13
Battlemage. Being within 5 feet of a hostile creature doesn't impose disadvantage on Zythan's ranged attack rolls.
Magic Resistance. Zythan has advantage on saving throws against spells and other magical effects.
Multiattack. Zythan makes three Dagger or Arcane Burst attacks.
Dagger. Melee or Ranged Weapon Attack: +7 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d4 + 2) piercing damage.
Arcane Burst. Ranged Spell Attack: +10 to hit, range 120 ft., one target. Hit: 27 (4d10 + 5) radiant damage.
Spirit Fissure (Recharge 4–6). Zythan causes a disruption in arcane energies in a 300-foot line that is 5 feet wide. Each creature in the line must make a DC 18 Constitution saving throw, taking 65 (10d12) radiant damage on a failed save, or half as much damage on a successful one.
Portent (3/Day). As a reaction to a creature Zythan can see making an attack roll, a saving throw, or an ability check, Zythan rolls a d20 and chooses whether to use that roll in place of the original roll.
CoA, p. 26