Brain Coral
verified
*unleashes a slew of brain coral*
*unleashes brain coral*
Unleashes brain coral, sometimes a slew of it.
Damage, targeting, duration, and counterplay are unconfirmed.
Undermind
Main Boss · Tidal Tomb · Slayer: Monstrous · Armored melee / mage
A 200,000-health armored hybrid with 50–60 melee damage, 150 Magery, and 30–40 spell damage. Its regional systems are documented, but a boss-specific ability breakdown is not yet public.
Encounter mechanics
Verified means a matching callout was recorded in the reviewed journal evidence. It does not confirm damage, timing, effects, or the interpretation of that callout. Read our evidence methodology.
Breath of the Deep
verified
*long breath of the deep*
*breath of the deep*
Announces a breath of the deep, sometimes a long breath.
Damage, targeting, duration, and counterplay are unconfirmed.
Drowned Monoliths
verified
*raises a swathe of drowned monoliths*
*raises drowned monoliths*
Raises drowned monoliths, sometimes a swathe of them.
Damage, targeting, duration, and counterplay are unconfirmed.
Extended Maw
verified
*hungrily extends maw*
*extends maw*
Extends its maw, with a hungry variant.
Damage, targeting, duration, and counterplay are unconfirmed.
Fishy Imprisonment
verified
*severe fishy imprisonment*
*fishy imprisonment*
Announces fishy imprisonment, with a severe variant.
Damage, targeting, duration, and counterplay are unconfirmed.
Mindshrooms
verified
*spews massive mindshrooms*
*spews mindshrooms*
Spews mindshrooms, with a massive variant.
Damage, targeting, duration, and counterplay are unconfirmed.
Reinforcement Call
verified
*raises hell*
Announces 'raises hell', suggesting a reinforcement cue.
Damage, targeting, duration, and counterplay are unconfirmed.
Interactive Objects — boss family verified, assignment unknown
unverified
Tidal Tomb boss abilities can create Drowned Monoliths, Abyssal Spheres, and Lightning Rods. Their progress bars can be double-clicked, and the objects can be damaged; no public source identifies which one belongs to The Undermind.
Oxygen Clock — verified regional
unverified
After 10 minutes without a refill, Minor Deprivation deals 5 unavoidable damage every 5 seconds while above 66% health. At 20 minutes, Major Deprivation deals 10 every 5 seconds while above 33%. Recovery Dolphins outside boss rooms fully refill Oxygen every 5 seconds.
Post-Death Effect — verified presentation
unverified
The Undermind has a dedicated post-death visual and sound sequence. Official notes do not describe an additional damaging after-death mechanic.
Pressure — verified system, boss use unconfirmed
unverified
When any Pressure stack expires, every active stack resolves together as raw damage that ignores armor, then all stacks are removed. Public documentation does not confirm that The Undermind itself applies Pressure.
Field notes
- Wait beside the Recovery Dolphin for a full refill before entering.
- If Pressure appears, heal before its shortest timer expires because all stacks resolve together.
- Double-click or damage active boss objects immediately, but do not rely on an unverified object assignment.
Report a correction with the behavior and evidence observed.