Underworld

Underworld Loot Island, in the Underworld beneath Eyeaduct.

“

Hey, it's me, the Bombinomicon. Guess what, guys? You're in Hell. It's good stuff. You're gonna like it here. Click to listen — The Bombinomicon

”

Underworld (introduced in Eyeaduct of the Very Scary Halloween Special update) refers to the several alternate play spaces mainly found in certain Haunted Halloween maps.

Underworlds differ from each other, but common characteristics among them are the presence of Magic spells, a harmful atmosphere, and deadly waters or Infernal Lava.

General features

Underworld locations draw from a number of features:

• Many Underworlds are accessed and exited through portals.
• Entry and exit buffs (overheal, invulnerability, Crits) and rare, powerful Magic Spells encourage players to learn to use some Underworld locations for tactical advantages in the main map.
• Underworld locations generally have mechanisms for limiting the time players can remain there, either by automatically killing off or pushing out all players that stay there for too long or by ending the round:
  • Several locations feature portals for returning to the main level, usually with the aforementioned exit buffs, to incentivize players to leave.
  • Many ​Underworld ​locations are surrounded by instantly-lethal hazards, such as Stygian water or lava.
  • Some Underworld locations​ cause Health drain on all players, either persistently (such as in Monster Bash) or after a certain grace period ends (such as Cursed Cove)​.
    • A map with multiple Underworlds (such as Eyeaduct) may have separate health-drain characteristics for each.
• Achievements with achievement items that can only be earned in certain Underworld locations encourage players to try out the location.

List of maps with Underworlds

Note: Community maps are identified in italics.

Map	Underworld	Features			Notes
		Contains†	On Entrance	On Exit
Bloodwater		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Bonesaw		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	N/A	All players are stunned and must race to a large pile of cash, the first player to reach it deciding the winning team of the match.
Brimstone		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Carnival of Carnage		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	N/A	All players are placed in Bumper Cars. The winning team is decided by the last team with at least one living player.
		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	N/A	All players are placed in Bumper Cars. The winning team is decided by whichever team collects 200 Ducks, or the last team with at least one living player.
		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	N/A	All players are placed in Bumper Cars. The winning team is decided by whichever team scores 3 goals (1 in Sudden Death), or the last team with at least one living player.
Cauldron		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Corruption		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Players can only use melee weapons and have an endless speed boost while in the underworld. Underworld layout is procedurally generated.
Cursed Cove		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Erebus		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Eyeaduct		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Loot Island Escaping the island grants the Dive Into a Good Book achievement, and with it the Bombinomicon.
Farmageddon		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Health drain only applies while portal is closed.
Ghost Fort		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Skull Island Escaping the island grants the A Lovely Vacation Spot achievement, and with it the Skull Island Topper.
Gravestone		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	N/A	All players are placed in Bumper Cars. The winning team is decided by whoever races to the end first, or the last team with at least one living player.
Hellstone		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Health drain only applies after lingering for too long.
Helltower		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	N/A	Health drain only applies after lingering for too long.
Helltrain		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	N/A	All players are forced into third-person view and can only use melee weapons. The winning team is decided by the last team with at least one living player.
Krampus		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Laughter		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Being inside after the entrance portal closes gives the player a bomb head, which explodes shortly after and kills them.
Lava Pit		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Los Muertos		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Mannsylvania		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Health drain only applies while portal is closed. Grants the Vampire Powerup upon exit.
Moldergrove		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Underworld is a 3v3 arena. The team that wins the 3v3 grants guaranteed Critical Hits for themselves and the rest of the team. If there are not enough players to begin a 3v3 when the timer runs out, anyone present in the underworld is teleported out and given a speed boost.
Monster Bash		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Moonshine Event		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Pit of Death		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Sandcastle		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Also grants increased jump height upon exit.
Slasher		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Soul-Mill		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	The secret exit also applies the Battalion's Backup buff.
Spookeyridge		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Terror		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Toxic		Health drain  Environmental hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell

^†Environmental hazards do not include pitfalls or similar hazards, as these are found in almost all underworlds.

See also

• Halloween map
• Halloween
• Hell
• Probed (flying saucer environment)