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

 * Fully cleared rooms will spawn a treasure chest in the center with gold, items, and healing.
 * Clearing an encounter will also reward each player in the room with gold and XP.
 * Amount of XP and gold gained differs by encounter type (creature encounters and chest encounters), and XP and gold rewards 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 XP per player for a creature encounter is 300. Base XP 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:

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.

Strategy

 * Dynamite can be used to destroy the otherwise impassable stone walls, or it can be sold for 800g, or it can be used as a 1000-damage nuke to an enemy team (with the proper setup, to ensure that it damages them). Be careful though, as placed dynamite will damage everyone in the radius, including yourself and your team. (1 tip here if you're playing as WK is to bait the enemy team into a choke such as a new room and place a dynamite there to suicide and take out the other team at the cost of your ultimate).
 * 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.
 * Observer Wards can be placed on the other side of gates and stone walls to scout ahead.
 * 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.
 * Some of the map is on higher elevation than others. Always try and fight enemy ranged heroes while you have the high ground.
 * Enemy corpses will always drop their items and current gold. Invest this gold into items to help you gain a lot of power quickly.
 * Always stay on the move. The timer is ticking and Roshan is moving inwards. Be careful not to get caught in a room he controls!
 * Potion of Cowardice is not only good for escaping, but also extremely useful for re-positioning, safely scouting, and initiating.
 * Players can right-click the corpses of dead enemy heroes to "finish them off", permanently killing them (and making them drop their loot). This process normally takes 20 seconds, but can be sped up if multiple heroes channel the action simultaneously.
 * Be wary of invisible enemy players as the game progresses, especially vs heroes like Riki, and in the very late game with 2-3 teams remaining when Shadowblade becomes that much more likely. Use Sentry Wards (or even Gem) to prevent enemies from getting the drop on you.
 * Channeling resurrection while invisible will reveal you to nearby enemies.
 * Some rooms may be too difficult for your team composition or current farm/exp level. Ideally you can clear any room, but there is no shame in trying to run thru the room to avoid the fight or looking for another way around.
 * Try to enter every room/every fight healthy and ready to go -- you never know when an enemy squad might show up. Buy and use Healing Salves as necessary.
 * 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.

Trivia

 * The Underhollow is a battle royal with cheese, referencing the famous Royale with cheese scene from Pulp Fiction.
 * The room "Knights of Ostarion"'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.