Lich Medium undead, evil 0 xp

Armor class 17 (natural armor)
Hit points 135 (18d8 + 54)
Speed 30 ft.

STR 11 (0)
DEX 16 (+3)
CON 16 (+3)
INT 20 (+5)
WIS 14 (+2)
CHA 16 (+3)

Languages:

Challenge: (0 xp)

A Lich’s Lair
A lich often haunts the abode it favored in life, such as a lonely tower, a haunted ruin, or an academy of black magic. Alternatively, some liches construct secret tombs filled with powerful guardians and traps.

Everything about a lich’s lair reflects its keen mind and wicked cunning, including the magic and mundane traps that secure it. Undead, constructs, and bound demons lurk in shadowy recesses, emerging to destroy those who dare to disturb the lich’s work.

A lich encountered in its lair has a challenge rating of 22 (41,000 XP).

Lair Actions
On initiative count 20 (losing initiative ties), the lich can take a lair action to cause one of the following magical effects, the lich can’t use the same effect two rounds in a row:

The lich rolls a d8 and regains a spell slot of that level or lower. If it has no spent spell slots of that level or lower, nothing happens.
The lich targets one creature it can see within 30 feet of it. A crackling cord of negative energy tethers the lich to the target. Whenever the lich takes damage, the target must make a DC 18 Constitution saving throw. On a failed save, the lich takes half the damage (rounded down), and the target takes the remaining damage. This tether lasts until initiative count 20 on the next round or until the lich or the target is no longer in the lich’s lair.
The lich calls forth the spirits of creatures that died in its lair. These apparitions materialize and attack one creature that the lich can see within 60 feet of it. The target must succeed on a DC 18 Constitution saving throw, taking 52 (15d6) necrotic damage on a failed save, or half as much damage on a success. The apparitions then disappear.

Turn Resistance: The lich has advantage on Saving Throws against any effect that turns Undead.

Actions

Legendary Actions

Can take 3 Legendary Actions, choosing from the options below. Only one legendary action can be used at a time, and only at the end of another creature's turn. Spent legendary Actions are regained at the start of each turn.

Cantrip: The lich casts a cantrip.

Paralyzing Touch (Costs 2 Actions): The lich uses its Paralyzing Touch.

Frightening Gaze (Costs 2 Actions): The lich fixes its gaze on one creature it can see within 10 feet of it. The target must succeed on a DC 18 Wisdom saving throw against this magic or become Frightened for 1 minute. The Frightened target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a target's saving throw is successful or the effect ends for it, the target is immune to the lich's gaze for the next 24 hours.

Disrupt Life (Costs 3 Actions): Each non-undead creature within 20 feet of the lich must make a DC 18 Constitution saving throw against this magic, taking 21 (6d6) necrotic damage on a failed save, or half as much damage on a successful one.