Keen Smell. The cat has advantage on Wisdom (Perception) checks that rely on smell.
Light Sensitivity. While in bright light, the cat has disadvantage on attack rolls and Wisdom (Perception) checks that rely on sight.
Incorporeal Movement. The cat can move through other creatures and objects as if they were difficult terrain. It takes 2 (1d4) force damage if it ends its turn inside an object.
Magic immunity. The cat of doom has total immunity to damage from spells and magical effects.
Perfect Invisibility. The cat, when it wants to be is immune to all methods of sight and perception including truesight.
Claws. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 1 slashing damage plus 10 (3d6) necrotic damage and the target must make a DC 13 Wisdom saving throw or take 7 (2d6) psychic damage and be stunned for one turn.
Yowl . The cat releases a mournful yowl. This yowl has no effect on constructs and undead. All other creatures within 30 feet of it that can hear it must make a DC 13 Constitution saving throw. On a failure, a creature drops to 0 hit points. On a success, a creature takes 10 (3d6) psychic damage.
Phantasms (3/day). The cat magically creates three illusory duplicates of itself if it isn't in bright light. The duplicates move with it and mimic its actions, shifting position so as to make it impossible to track which cat is the real one. If the cat is ever in an area of bright light, the duplicates disappear.
Whenever any creature targets the cat with an attack or a harmful spell while a duplicate remains, that creature rolls randomly to determine whether it targets the cat or one of the duplicates. A creature is unaffected by this magical effect if it can't see or if it relies on senses other than sight.
A duplicate has the cat's AC and uses its saving throws. If an attack hits a duplicate, or if a duplicate fails a saving throw against an effect that deals damage, the duplicate disappears.
Description
A cat of doom is a specter of death whose presence is often felt but not seen at funerals and the deaths of random people.
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Posted Jan 15, 2021I incorporated the Cats of Doom into an encounter as a "warm-up" to a banshee encounter but it almost became a TPK. I did not anticipate that *all* of the PCs would fail their constitution saving through against the Yowl. The only thing that saved them was a bonus inspiration die that one PC had earned earlier in the evening that boosted their roll just enough to make the save. This is not a criticism of this homebrew - just a reminder that anything can happen in an encounter.
My players loved this encounter. The bard wrote a song about it and I devised that the song spread in popularity throughout Tal Dorei because of the uniqueness of the encounter and the "beating the odds and surviving" nature the combat. They often hear it played in taverns where the people don't even know them - and enjoy lots of free drinks when the connection to them is made.