Sentinel crystal

A crystal shrine

Sentinel crystals are a collectible item found in Doom Eternal, replacing the Argent cells from Doom (2016). Found inside small blue shrines, each crystal that the Doom Slayer finds allows him to increase either his maximum health, armor or ammo capacity as desired—each stat can be upgraded four times, therefore there are twelve crystals in all to locate.

The first crystal is found in the Fortress of Doom after completing Hell on Earth and must be taken to advance the game; the remaining crystals can then be found off the beaten path in subsequent levels (two further crystals are stored in the Fortress and require two Sentinel batteries each to acquire). On selecting an upgrade, the Slayer breaks the shrine open with a punch before taking the crystal inside it.

Boosts

Each health upgrade increases maximum health by 25 points, from a base capacity of 100 up to a maximum of 200. Each armor upgrade increases maximum armor by 25 points, from a base capacity of 50 up to a maximum of 150.

Each ammo upgrade increases the maximum ammo capacity for all standard weapons by a linear amount. Argent cells and the chainsaw are not affected; players can only ever hold a maximum of 60 Argent ammo and three units of chainsaw fuel at a time.

Ammo Capacity Upgrade

Weapon	Base capacity	Increment per crystal	Max capacity
Shotgun shells	16	+2	24
Bullets	60	+30	180
Cells	150	+25	250
Rockets	9	+1	13

Linked bonuses

The selection screen for Sentinel crystal upgrades. The ammo upgrade linked to the "Loot Magnet" bonus is currently selected.

As well as the direct boosts, there are six further bonuses that can be unlocked by purchasing both upgrades linked to a particular bonus.

• Quickdraw Belch: "Flame Belch takes less time to cooldown [sic]."
• Loot Magnet: "Resource drops get pulled in from much further away."
• Napalm Belch: "Heavy and Super Heavy demons stay on fire longer."
• Health for Blood: "As long as you're at max health, all health pickups contribute to Blood Punch."
• Belch Armor Boost: "Demons drop armor at a faster rate."
• Armor for Blood: "As long as you're at max armor, all armor pickups contribute to Blood Punch."

Using the first crystal completes the "Crystal Craving" milestone, and fully upgrading either health, armor or ammo will complete the "King of the Crystals" milestone. Conversely, completing the game with only one crystal and one Praetor suit perk will complete the "Can't Perfect Perfection" milestone.

Crystals do not appear in Part One and Part Two of The Ancient Gods; players start with all crystal upgrades already unlocked.

Trivia

Taking the crystal

• The Wraith's Crystal used to power the Gate of Divum in Part Two looks identical to a Sentinel crystal.