When a myconid colony attempts to transform a dead aboleth into a spore servant, an aboleth spore tyrant is is the unfortunate result. The mind of the aboleth is able to take control of the mushrooms reanimating its own body, and consequently, it regains control of its corpse.

Psychic Mushrooms. Aboleth spore tyrants are covered in countless mushrooms, and their partially decayed bodies a filled with spores. These and other mushrooms around the tyrants are warped by their phychic powers. Such spores serve as a substitute for the aboleth's weakened powers of enslavement.

Fungal Tyrants. Aboleth spore tyrants often attempt to take over the myconid colony that created them. When they succeed, the colony becomes a hive mind under the control of the aboleth. Conflicts between myconid colonies and spore tyrants often last for decades, with the aboleth slowly taking over.

Echoing Memories. Although aboleth spore tyrants must use their body as a vessel for their mind, memories of their life can manifest as an illusory second aboleth known as an ancestral echo. These echos serve can appear in many ways, but the most common example is for the echo to apear on land as a horrifying amalgamation of mushrooms twisted into the form of an aboleth. Spore tyrants often use these echos as a means of extending their influence, and waging war on myconid colonies alongside their chuul spore servants.

Aboleths lair in subterranean lakes or the rocky depths of the ocean, often surrounded by the ruins of an ancient, fallen aboleth city. An aboleth spends most of its existence underwater, surfacing occasionally to treat with visitors or worshipers.

Lair Actions

When fighting inside its lair, an aboleth spore tyrant can invoke the ambient magic to take lair actions. On initiative count 20 (losing initiative ties), the aboleth takes a lair action to cause one of the following effects:

• The aboleth spore tyrant casts phantasmal force (no components required) on any number of creatures it can see within 60 feet of it. While maintaining concentration on this effect, the aboleth can’t take other lair actions. If a target succeeds on the saving throw or if the effect ends for it, the target is immune to the aboleth’s phantasmal force lair action for the next 24 hours, although such a creature can choose to be affected.
• Pools of water within 90 feet of the aboleth spore tyrant surge outward in a grasping tide. Any creature on the ground within 20 feet of such a pool must succeed on a DC 14 Strength saving throw or be pulled up to 20 feet into the water and knocked prone. The aboleth can’t use this lair action again until it has used a different one.
• Water in the aboleth spore tyrant’s lair magically becomes a conduit for the creature’s rage. The aboleth can target any number of creatures it can see in such water within 90 feet of it. A target must succeed on a DC 14 Wisdom saving throw or take 7 (2d6) psychic damage. The aboleth can’t use this lair action again until it has used a different one.

Regional Effects

The region containing an aboleth’s lair is warped by the creature’s presence, which creates one or more of the following effects:

• Underground surfaces within 1 mile of the aboleth spore tyrant’s lair are slimy and wet and are difficult terrain. Additionally, they can be covered in aberrant mushrooms. If a creature eats one of the mushrooms, they must succeed on a DC 12 wisdom saving throw. On a failure, the creature gains a random form of indefinite madness that lasts until the creature is cured of the disease or dies. While infected in this way, the creature cannot be reinfected, and it must repeat the saving throw at the end of every 24 hours, ending the infestation on a success.
• Water sources within 1 mile of the lair are supernaturally fouled. Enemies of the aboleth spore tyrant that drink such water vomit it within minutes. The vomit is filled with aberrant mushrooms.
• As an bonus action, the aboleth spore tyrant can create an illusory image of itself within 1 mile of the lair. The copy can appear at any location the aboleth has seen before or in any location a creature charmed by the aboleth can currently see. Once created, the image lasts for as long as the aboleth maintains concentration, as if concentrating on a spell. Although the image is intangible, it looks, sounds, and can move like the aboleth. The aboleth speak and use telepathy from the image’s position as if present at that position. If the image takes any damage, it disappears.

If the aboleth spore tyrant dies, the first two effects fade over the course of 3d10 days.