Chancellor of the Annex

Disrupting Aura. If a creature attempts to cast a spell of
1st level or higher within 60 feet of the chancellor, it
must use a spell slot at least one level higher than the
spell's original level. Otherwise the spell fails and has
no effect. A creature affected by this trait becomes
aware of its effect when it starts casting a spell, before
the spell slot is spent (thus allowing it to use a
different slot). At the start of its turn, the chancellor
can select any number of creatures it can see to be
unaffected by this trait.

Legendary Resistance (3/day). If the chancellor fails a
saving throw, it can choose to succeed instead.

Multiattack. The chancellor maks three attacks: one
with its arm blade and two with its claw.

Arm Blade. Melee Weapon Attack: +10 to hit, reach 5
ft., one target. Hit: 17 (2d10 + 6) piercing damage

Claw. Melee Weapon Attack: +10 to hit, reach 5 ft., one
target. Hit: 13 (2d6 + 6) slashing damage

The chancellor can take 3 legendary actions, choosing
from the options below. Only one legendary action
option can be used at a time and only at the end of
another creature’s turn. The chancellor regains spent
legendary actions at the start of its turn.

Attack. The chancellor makes one claw attack.

Fly. The chancellor flies up to its speed.

Phyrexian Blessing. The chancellor gains resistance to
one damage type of its choice until the start of its next
turn or until it uses this action again.

Bone Shards (Cost 2 Actions). The chancellor beats its
wings and shoots sharp bones from its body.Each
creature within 10 feet of the chancellor must succeed
on a DC 18 Dexterity saving throw, taking 13 (3d8)
piercing damage on a failed save, or half as much
damage on a successful one.