Monsters are creatures in Clicker Heroes that spawn on zones and must be killed in order to progress in the game. Upon defeat, they will drop Gold, which can be used to hire and upgrade heroes.

Each monster has a set amount of HP, or hit points, equal to the amount of damage that must be dealt to kill it. Monsters of the same zone will always have the same amount of HP, and with each zone, the number of HP all monsters have rises.

The formula for monster HP at any zone can be found here.

As the monsters get more HP, their Gold drop will also increase to keep up with the increased cost of the heroes that need to kill the monsters.

The formula for monster Gold drop at any zone can be found here.

To advance in zones and progress in the game, you have to kill a certain amount of monsters each zone. This number depends on the following factors:

There are two types of zones: regular zones and boss zones. Regular zones require you to kill 10 (plus 0.1 for each 500 zones) monsters in order to unlock the next zone; boss zones only one. To make up for that, monsters on boss zones have more HP than a monster on a regular zone would have, and they have to be defeated within 30 seconds.

Kumawakamaru lowers the number of monsters required to finish a regular zone, up to a -8 reduction. This is not taking into account your level of Borb, unless it is 0.

There are 11 different zone types, each containing a different set of regular monsters. Every zone type lasts 10 levels before it switches to the next one, with the exception of the first 10 zones, which contain 2 zone types instead of 1. Below is a list of which monsters appear on which type of zone.

Treasure Chest can be found on any non-boss zone. They give 10× the zones's base Gold when killed and that number can be increased further by Mimzee. The base spawn rate of Treasure Chest is 1%, but it can be raised with Dora.

A Relic Ooze may replace any non-boss monster that would have spawned between zone 99 and 2/3rd of your highest zone, once per Ascension and only after your first Ascension. They drop Relic, equip-able items that provide various bonuses, similar to Ancients.

Starting at level 100, every boss zone has a chance to contain a Primal Boss instead. Primal Bosses are just like regular bosses, except for the fact that they give you Hero Souls, as well as the regular amount of Gold. Just like Gold, Hero Souls scales depending on your zone. Only the first boss on a zone can ever be primal. Once it has been defeated, the next boss that spawns will be a regular one, and will not award Hero Souls again. However, failing to beat a primal boss and returning to the zone will mean that the boss is primal.

In addition, every 100 zones up to zone 1000 a Centurion Boss can be found. The game will treat them as if the zone had a Primal Boss, the only difference being that Centurion Bosses have a 100% spawn rate, whereas Primal Bosses only spawn 25% of the time. Atman can increase this to over 100%, although realistically the percentage cannot surpass 100. PBC decreases however which is the reason for Atman being able to do so.

The 10 Centurion Bosses are unique monsters that cannot be found on any other zone. When you defeat these bosses for the first time, you will get an achievement.

When reaching a boss level, there is a very low chance that instead of the normal boss for that level, it will spawn this "Kappa" boss instead. It is a Turtloid Warlock enemy, but with the twitch.tv "Kappa" emote on its face.

Immortals are boss monsters that only appear in Clan raids, and as such, being in a Clan is required for fighting them. They don't take damage from your DPS, instead you have to click them or use Auto Clickers, but with damage that only increases when you get primal Hero Souls. Killing them rewards you with Hero Souls.

Mass Murderer