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The subject of this article appears in Call of Duty: WWII
For the Zombie enemy, see Catalyst.

"Access to a serum which improves weapon handling while active. Serum replenishes over time."
— In-game description

Catalyst is a Basic Training featured in Call of Duty: WWII added in the Shadow War update.

Catalyst allows the player gain access to a special serum that can be used in battle to increase weapon handling for a short time.

The serum lasts for 10 seconds, has a 20 second cooldown (which starts after the serum has expired) and has powerful effects. It increases the fire rate of weapons by 30%, reduces hip fire spread by 50% and increases reload speed by about 40%. The additional fire rate stacks with Rapid Fire, the reduced hip spread stacks with Steady Aim and technically, the increased reload speed stacks with Hustle.

When used wisely and with fast firing weapons such as the MG42 or MG 15 the serum will allow the player to mow down multiple enemies at once with ease.

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