Bogmire, the Cemetery Shadow (CR 3)

Legendary Resistance (2/day). When Bogmire fails a saving throw, it can choose to succeed it instead.

Ghostly Attacks. Bogmire's attacks are considered magical.

Incorporeal Movement. Bogmire can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.

Lightning Strike. A black cloud forms, and a bolt of purple lightning shoots through the air towards a point that Bogmire can see. The lightning bolt explodes as soon as it hits the point. Anyone within 10ft. must succeed a DC 14 dexterity saving throw or take 4d6 lightning damage.

Shadow Bogmire Summon. Black, inky lightning shoots through the sky at a single point that Bogmire can see. A Shadow Bogmire then rises from the point in which the lightning struck.

Bogmire 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. Bogmire regains spent legendary actions at the start of its turn.

Lightning Strike (Costs 2 Actions). Bogmire uses Lightning Strike.

Teleport (Costs 2 Actions). Yellow lightning strikes Bogmire, causing it to disappear. Yellow lightning also strikes another location within 100ft., and Bogmire appears where the lightning struck.

Move. Bogmire moves up to its full movement speed.