
In the video game Dead Cells, players can obtain a power skill called Mushroom Boi! as part of the Bad Seed DLC. Mushroom Boi! is a friendly Jerkshroom that follows the player around and attacks nearby enemies. It is also the key to unlocking the Deal with the Devil achievement and a secret interaction. To do this, players must enter the Morass of the Banished with Mushroom Boi! and sacrifice it near the altar by making it explode. If there are no enemies around, Mushroom Boi! will automatically jump onto the altar and explode, skipping the subsequent fight with Mama Tick. This grants players the Sacrificial Tick Outfit and the achievement.
| Characteristics | Values |
|---|---|
| How to sacrifice Mushroom Boi | To sacrifice Mushroom Boi, the player must go to the Morass of the Banished. At the end of the biome, the player will find the Swamp Priest who stands next to an altar that depicts Mama Tick. The Swamp Priest asks the player to offer a sacrifice, namely the Mushroom Boi. If the player complies, the Mushroom Boi explodes and is completely removed from the player's inventory. The player then skips the subsequent fight with Mama Tick. |
| How to obtain the Sacrificial Tick Outfit | To obtain the Sacrificial Tick Outfit, the player must sacrifice the Mushroom Boi to the Swamp Priest in the Morass of the Banished. |
| How to obtain the "Deal with the Devil" achievement | To obtain the "Deal with the Devil" achievement, the player must have Mushroom Boi and enter the Morass of the Banished. The player must then sacrifice the Mushroom Boi near the altar by making him explode. The man next to the altar will say "your sacrifice has been accepted!" and the player will obtain the achievement. |
| How to obtain the "Who's a good boi?" achievement | To obtain the "Who's a good boi?" achievement, the player must beat the final boss while the Mushroom Boi is active and not detonate him. |
| How to avoid sacrificing Mushroom Boi | To avoid sacrificing Mushroom Boi, the player can finish the game without triggering the Boi's explosion. The player can also buy the Boi before fighting the Hand of the King to avoid sacrificing him. |
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What You'll Learn

Go to the Morass of the Banished
To sacrifice Mushroom Boi, you must first enter the Morass of the Banished. This is a biome within the Dead Cells game, developed by Motion Twin, a French independent developer based in Bordeaux.
In the Morass of the Banished, the player must navigate to the end of the biome, where they will encounter the Swamp Priest, a masked figure standing next to an altar. This altar depicts Mama Tick, a boss character in the game. The Swamp Priest will urge the player to offer a sacrifice, specifically the Mushroom Boi.
Mushroom Boi is a friendly Jerkshroom that follows the player around and attacks nearby enemies. It is a power skill exclusive to the Bad Seed DLC in Dead Cells. By sacrificing Mushroom Boi at the altar, players can initiate a ritual that grants them the Sacrificial Tick Outfit. However, this outfit can only be obtained the first time the ritual is performed, unless the player did not hand it over to the Collector.
To sacrifice Mushroom Boi, players must detonate him by using the skill again while he is still active, causing him to explode on the altar. If there are no enemies nearby and the player is close to the altar, Mushroom Boi will automatically jump onto the altar and explode. This action will remove Mushroom Boi from the player's inventory and skip the subsequent fight with Mama Tick.
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Reach the end of the biome
To reach the end of the biome in Dead Cells and sacrifice Mushroom Boi, players must go to the Morass of the Banished. This is a swamp-like area where a masked individual known as the Swamp Priest resides. The Swamp Priest stands next to an altar that depicts Mama Tick and asks the player to offer a sacrifice—specifically, the Mushroom Boi.
To initiate the sacrificial ritual, players must first obtain the Mushroom Boi! power skill. This skill is exclusive to the Bad Seed DLC and spawns a friendly Jerkshroom that follows the player and attacks nearby enemies. With the Mushroom Boi! skill active, players must then reach the end of the Morass of the Banished biome, where the Swamp Priest awaits.
Once players have reached the Swamp Priest, they must interact with the altar and sacrifice the Mushroom Boi. If there are no enemies nearby and players are close to the altar, the Mushroom Boi will automatically jump onto the altar and explode, removing the skill from the player's inventory. This action completes the sacrificial ritual and grants players the Sacrificial Tick Outfit.
It is important to note that the outfit can only be obtained the first time the ritual is performed. Subsequent visits and sacrifices will result in the same outcome, but the outfit will not be granted again unless the player did not hand it over to the Collector. Additionally, sacrificing the Mushroom Boi allows players to skip the subsequent fight with Mama Tick, as she will simply disappear.
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Find the Swamp Priest
To find the Swamp Priest, players must enter the Morass of the Banished. This is a biome that players must traverse to the end to reach the Swamp Priest. The Swamp Priest is a masked figure who stands at the end of the Morass of the Banished, next to an altar depicting Mama Tick.
The Swamp Priest is a key character in the sacrificial ritual of Mushroom Boi, a power skill exclusive to the Bad Seed DLC. Mushroom Boi spawns a friendly Jerkshroom that follows the player and attacks nearby enemies. When the player reaches the Swamp Priest, they are prompted to offer a sacrifice, specifically Mushroom Boi.
If the player complies and sacrifices Mushroom Boi by detonating it while it is active, the skill is removed from their inventory, and the subsequent fight with Mama Tick is skipped. The altar plays a crucial role in this ritual, as Mushroom Boi must be detonated near it for the sacrifice to be accepted.
It is important to note that the ritual can be repeated on subsequent visits, but the Sacrificial Tick Outfit can only be obtained the first time unless the player did not hand it over to the Collector. Additionally, there are different ways to interact with Mushroom Boi and the altar, which can lead to various achievements and outcomes in the game.
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Stand in front of the altar
To stand in front of the altar, you must first enter the Morass of the Banished. Here, you will find the Swamp Priest, a masked figure, standing next to an altar that depicts Mama Tick.
The Swamp Priest will urge you to offer a sacrifice, specifically the Mushroom Boi. If you have the Mushroom Boi, stand in front of the altar and use the skill again while the Mushroom Boi is active. This will cause the Mushroom Boi to jump onto the altar and explode, removing it from your inventory.
It is important to note that this action will skip the subsequent fight with Mama Tick, and you will not obtain the Sacrificial Tick Outfit unless it is your first time performing this ritual.
Additionally, you do not have to pass the altar to complete the game. However, if you wish to sacrifice the Mushroom Boi, ensure that there are no enemies around and you are close to the altar.
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Make Mushroom Boi explode
To make Mushroom Boi explode, you must detonate it by using the skill again while it is still active. This will cause the Jerkshroom to jump onto the altar and explode while screaming "Why?", dealing 300 base damage to any nearby enemies. This removes the skill from the player's inventory and skips the subsequent fight with Mama Tick.
The Mushroom Boi is a power skill exclusive to the Bad Seed DLC. It spawns a friendly Jerkshroom that follows the player around and attacks nearby enemies. If an enemy is close by, the Jerkshroom will charge at them, dealing a base of 50 damage on impact. If the enemy then hits a wall, an additional 100 damage is inflicted.
The Mushroom Boi is also part of a sacrificial ritual that grants the player the Sacrificial Tick Outfit. To initiate this ritual, the player must go to the Morass of the Banished and reach the end of the biome, where they will find the Swamp Priest. The Swamp Priest will ask the player to offer a sacrifice, specifically the Mushroom Boi. If the player complies, the Mushroom Boi is removed from their inventory, and the fight that should take place in the Nest will not occur.
It is important to note that while the ritual can be repeated on subsequent visits, the outfit can only be obtained the first time unless the player did not hand it over to the Collector. Additionally, if the player has a ranged weapon and attacks Mama Tick when she raises her eye above the water, the fight will begin as usual, and the outfit blueprint will not be dropped.
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Frequently asked questions
To sacrifice Mushroom Boi, you must enter the Morass of the Banished and reach the end of the biome, where the Swamp Priest resides. Stand in front of the altar that depicts Mama Tick and activate Mushroom Boi again to make him explode.
Sacrificing Mushroom Boi grants you the "Deal with the Devil" achievement and the Sacrificial Tick Outfit.
If you don't sacrifice Mushroom Boi, you will have to fight Mama Tick in the Nest. You will also miss out on the achievement and outfit mentioned above.

























