on initiative count 20 (losing initiative ties), Alquam takes a lair action to cause one of the following effects; Alquam can’t use the same effect two rounds in a row:

• Alquam snuffs all light sources within the lair. Spells that create light are dispelled, mundane light sources are extinguished, and magical light sources are suppressed. Even light created by artifacts is reduced to dim light with half its normal radius of illumination. This lasts until initiative count 20 on the following round.

• Haunting, maddening music emanates from a point Alquam can see. Creatures within 50 feet of the origin that can hear the music must make a DC 15 Wisdom saving throw. Those that fail are charmed, incapacitated, and have their speed reduced to 0 until they take damage or until initiative count 20 on the following round.

• Black tendrils writhe around up to three creatures Alquam can see within 100 feet. The creatures must succeed on a DC 15 Strength saving throw or be restrained until initiative count 20 on the following round.

Alquam can take the Hide action as a bonus action on each turn while it is in dim light or darkness, even if it is being observed.

Alquam has advantage on Wisdom (Perception) checks that rely on sight.

If Alquam fails a saving throw, it can choose to succeed instead.

Alquam has advantage on saving throws against spells and other magical effects.

Alquam’s weapon attacks are magical.

the region containing Alquam’s lair is warped by the demon lord’s magic, which creates one or more of the following effects:

• Within 1 mile of the lair all light sources except artifacts shed light to only half the usual radius.

• Owls and other nocturnal beasts become enraged and hostile within 5 miles of the lair, attacking intruders individually and in swarms.

• Within 1 mile of the lair, Alquam can cast his senses into any area of dim light or darkness as if using clairvoyance.

if Alquam dies, conditions in the area surrounding the lair return to normal over the course of 1d10 days.