Void Step. No sound exists within a 5ft radius of Boros.
Silent Casting. When casting a spell, Boros ignores any verbal components needed.
Amorphous. Boros' form is fluid. It can change at will to suit its needs.
Fate Weaving. Boros can read the weaves of fate. Boros can't be surprised and has advantage on attack rolls, ability checks, and saving throws. Additionally, other creatures have disadvantage on attack rolls against it.
Beyond Time. Boros' body is beyond the influence of the passing of time and does not age.
Spellcasting. Its spellcasting ability is Intelligence and Wisdom (spell save DC 26, +18 to hit with spell attacks).
2/day each: [vampiric touch] (8th), [disintegrate] (8th), [dark star], [fireball] (8th)
1/day each: [power word heal], [time stop], [ravenous void]
Astral Flurry. Melee Weapon Attack: +18 to hit, reach 15 ft., Make up to 4 attacks. Hit: 2d12 + 10 [force] damage. If a creature is hit at least once, it must make a CON save (DC26). On a failed save the creature become stunned until the end of Boros' next turn. If a creature is hit 2 or more times, it has disadvantage on the save.
Fate's Lashing. Melee Weapon Attack: +18 to hit, reach 10 ft., Make up to 2 attacks. Hit: 2d10 + 4d8 + 10 [force] damage. Regain half of any damage dealt by this attack action. If a creature is hit twice, it must make a CON save (DC26). On a failed save, their maximum HP is reduced by the same amount healed until it finishes a long rest.
Snake Bite. RangedWeapon Attack: +18 to hit, range 80/320 ft., 1 target. Hit: 3d10 + 1d8 + 11d6 + 10 [necrotic] damage. On hit, the creature must make a CON save (DC26). On a failed save, the creature takes 12d6 [poison] damage.
Devour (3/Day). Boros can counter any magic or divine essence that forms within 60ft of it. For countering spells treat this ability as a 9th level counterspell.
Attack of Opportunity. You can make an opportunity attack when a hostile creature that you can see moves out of your reach. To make the opportunity attack, you use your reaction to make one melee attack against the provoking creature. The attack occurs right before the creature leaves your reach
Phantom Nova (Recharge 5-6). RangedWeapon Attack: +18 to hit, range 80/320 ft., 1 target.
Regardless if the attack hits or not, as the phantom arrow is released from the bow it emits a screeching wail only heard by the attack's intended target. The creature must make a WIS save (DC26). On a failed save, the creature is paralyzed for one turn.
Roll 1d4, the phantom arrow forms splinters equal to the amount rolled that travels alongside the main arrow to the intended target. Each of these arrows do an additional 1d10 + 1d8 + 5d6 [necrotic] damage.
Hit: 3d10 + 1d8 + 11d6 + 10 [necrotic] damage, adding the arrow splinter(s)' damage separately. On hit, the creature must make a CON save (DC26). On a failed save, the creature takes 12d6 [poison] damage.
When the phantom arrow hits the creature, a star forms on the creature and instantaneously erupts with a blinding sunlight in a 60-foot radius sphere centered on the star. Each creature in that light must make a CON save. On a failed save, a creature takes 12d6 [radiant] damage and is blinded for 1 minute. On a successful save, it takes half as much damage and isn't blinded by this spell. Undead and oozes have disadvantage on this saving throw. A creature blinded by this spell makes another Constitution saving throw at the end of each of its turns. On a successful save, it is no longer blinded. This spell dispels any darkness in its area that was created by a spell.
The star then implodes, creating a destructive gravitational force in the 60 ft radius. Within the 60 ft radius sphere the terrain is considered difficult terrain, and nonmagical objects fully inside the sphere are destroyed if they aren’t being worn or carried. When the star implodes, a creature within the sphere's range must succeed on a STR save (DC26) or be pulled straight toward the sphere’s center, ending in an unoccupied space as close to the center as possible. All creatures within the sphere takes 5d10 [force] damage. A creature reduced to 0 hit points by this spell is annihilated, along with any nonmagical items it is wearing or carrying.
The dissipation of the gravitational force leaves a void where time ravages everything within it. A creature within the 60 ft sphere, its physical form is put through the devastation of rapid aging. The creature must make a CON save, taking 10d12 [necrotic] damage on a failed save, or half as much damage on a successful one. If the save fails, the creature has disadvantage on attack rolls, ability checks, and saving throws, and its walking speed is halved. Only the wish spell or the greater restoration cast with a 9th-level spell slot can end these effects and restore the target to its previous age.