The Underhollow



The Underhollow is a dungeon brawl in which eight teams of three players must battle and evade each other on a maze-like map in search of Roshefort, Roshan's rarest cheese. This game mode is only available to owners of The International 2018 Battle Pass.

General information

 * Be the last team standing to win.
 * Dead allies can be revived to 50% HP/MP by clicking on their gravestone and waiting a few seconds.
 * If an enemy dies, but their team remains alive, you can eliminate the enemy completely by clicking on their gravestone. This takes 20 seconds.
 * A team is defeated when all its members are dead.
 * Eliminate other players to acquire their gold and items.

Heroes

 * Players can pick from most of the heroes available in Dota. Their abilities remain unchanged from the base game of Dota.
 * Heroes start at Level 1, and have an, , and two s.

Modified Heroes

 * Some heroes have altered abilities made specifically for this event.
 * Click on a hero's icon to see their custom stats and abilities for this event.

Rooms

 * Clearing a room of enemy NPCs spawns a treasure chest at the center of the room, which drops gold bags, random items based on the room's tier, and health and mana potions.
 * Clearing an room also rewards each player in the room with gold and experience.
 * The amount of experience and gold gained differs based on the encounter type (creature encounters and chest encounters), and are scaled by 0.5 for each encounter level, starting at x1 for encounter level 1 to up to x2.5 for encounter level 4.
 * Base gold per player for a creature encounter is 75. Base gold for per player for a chest encounter is 100.
 * Base experience per player for a creature encounter is 300. Base experience per player for a chest encounter is 200.
 * Shops have a 50% chance to appear in rooms. They sell items and healing potions.
 * Rooms closer to the center are more difficult and contain better loot.
 * Rooms range from level 1 to level 4. Certain encounters can only be found in certain room levels. A table of these encounters is below.
 * Each depth level (cavern ring segment) contains a decreasing amount of trap rooms (higher depth means deeper towards the center of the cavern):
 * Depth 1 has 4 traps
 * Depth 2 has 2 traps
 * Depth 3 has 1 trap
 * Depth 4 has 0 traps
 * Roshan destroys a ring of rooms every five minutes, starting with the easier outer ring. Players in destroyed rooms take very high damage per second.
 * The contents of the map are randomly generated each time you play, so while the rooms physically remain the same, their location, difficulty and rewards will differ.
 * By default, every room will always have between 5 and 7 breakables and between 5 and 7 trees positioned randomly around the room. Unless it is a special room or if a particular encounter spawns additional trees and/or breakables.

Treasures

 * Various types of treasure chests can be found by clearing rooms.

Items and gold

 * Items are found in chests, crates or purchased from shopkeepers.

Unavailable Items
The following items cannot be purchased, built or found in this game mode:

Modified Items
All items are fully sharable with allies. Besides this, the following items have been further modified:

Strategy

 * Dynamite can be used to destroy the otherwise impassable stone walls, or sold for 800g, or used as a 1000-damage nuke against enemies. Be careful though, as the explosion will damage everyone in the radius, including your team.
 * Always open chests before going shopping. Often, whole assembled items will drop from chests, which may change your purchasing choices. Alternatively, you can sell the items you receive from those chests for gold.
 * s can be placed on the other side of gates and stone walls to scout ahead, or left behind to detect flanking enemy teams.
 * Some heroes are better at clearing creeps, some are better at clearing "boss" units, and some are better at fighting enemy heroes. Try to find a good balance between these so that your team is not too weak in one area.
 * s restore a lot of health early on, and is not canceled by non-player damage.
 * Some of the map is on higher elevation than others, giving a vision advantage. Always try and fight enemy ranged heroes while you have the high ground.
 * Escape Potions are extremely useful for re-positioning, scouting, and initiating.
 * Channeling resurrection while invisible will reveal you to nearby enemies.
 * Beware invisible enemy players as the game progresses, especially heroes like, and in the very late game with 2-3 teams remaining when becomes more common. Buy detection to prevent enemies from getting the drop on you.
 * Some rooms may be too difficult for your team. There is no shame in trying to run through the room to avoid the fight or looking for another way around.
 * Remember to rest and shop between rooms in case you run into an enemy team in the next room.
 * Many, if not all, sounds in this mode can be heard through the fog. It is possible to identify where enemies are by where you hear sounds coming from, long before you actually see them.
 * Stick with your team. There is very little reason to ever split up.
 * Divvy up room loot fairly to whoever can use it best. Avoid selling loot until everyone already has full slots. Remember, don't be greedy -- you win as a team, and you lose as a team.
 * Items are shareable. Pass your to Gyrocopter after using your upgraded ability. If you're about to die, pass your best items to a core teammate to push through a fight.

Rewards

 * Players can earn Battle Points for The International 2018 Battle Pass.

Caps and bonuses

 * Players can only earn a maximum amount of Battle Pass points per week. This cap can be increased by leveling the Battle Pass.

Emoticons

 * Emoticons are rewarded for winning matches.

Trivia

 * The Underhollow is a battle royal with cheese, referencing the famous Royale with cheese scene from Pulp Fiction.
 * The room Knights of Ostarion room's description text is in all caps. This is a reference to CAPS LOCK LEORIC, an infamous item build from the DotA Allstars days.
 * The model in the "Lord of Oblivion" room is wearing the Golden Nether Lord's Regalia Set. This set was distributed to only 25 players worldwide, making it one of the rarest cosmetics in the game.
 * The room "Exort Trionis!" contains small s casting . When Sun Strike is d by players, Invoker will often say the phrase "Exort Trionis!", meaning "Three Exort", the invoke code for Sun Strike.
 * This game mode shares assets with The Emerald Abyss terrain.
 * The Ogre Smasher room was originally intended to have that would cast  and throw  at players, but were cut prior to release.