The Rat King is the definition of teamwork in Destiny 2. On its own, the Rat King is a handy weapon for Hunters thanks to its invisibility after each reload following a kill. But if every member of a team is wielding a Rat King, they collectively grow in strength to do incredible damage.

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The Rat King Catalyst is strongly recommended for players who plan on using this weapon a lot. It gives the weapon a lot more milage and makes it much more useful for Hunters who rely on the invisibility. Here’s what all players need to know about what the Rat King Catalyst does and how to get it.

The Rat King Catalyst provides a perk to the weapon called Infestation. Infestation provides three separate benefits to the Rat King:

• Improve aim assist
• Improve recoil direction
• Triggering Vermin invisibility now refreshes health

Better aiming and recoil direction is always nice with a sidearm. However, the refresh health upon invisibility is really the meat of the Rat King Catalyst. By getting into the habit of reloading after every kill, the player will briefly go invisible and receive a brief health refresh. For Hunters, this is great for ensuring survivability and makes PVP a lot more interesting.

The Rat King Catalyst will randomly be rewarded to the player upon completing Heroic or Nightfall Strikes. There doesn’t seem to be any concrete evidence that doing one or the other will increase the odds of a drop.

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While the exact odds of it dropping are unknown, it is really rare. It will most likely take a few dozen Strikes, according to players. There unfortunately doesn’t seem to be a way of increasing these odds such that Rat King Catalyst will be the Catalyst to appear. Thus, players shouldn’t be surprised if they get another Nightfall Strike-based Catalyst like the Merciless Catalyst.

Upgrading the Rat King Catalyst can either be a little annoyin, or one of the hardest things a player will do. This is because it requires a teammate killing one thousand enemies using the Rat King. One thousand enemies is an annoying grind in its own right, but convincing another player to do it so their friend can get the Catalyst upgrade is a tough one.

This is also one of the few times that kills for a Catalyst upgrade cannot be done retroactively. The player must first have the Rat King Catalyst, and then a fireteam member will need to get the one thousand kills.

Getting the Rat King Catalyst is best done on easy and fast, to complete Heroic Strikes. Nightfalls will be handy, but they’re not as efficient for time to complete. In all reality though, the player will do plenty of both before getting the Rat King Catalyst.

As far as upgrading, the best way is to get an entire clan to commit to using the Rat King. Each kill by any member of the fireteam will count. The best way to do this is to find a group of players who either want to upgrade their Rat King Catalysts, or like using the Rat King in general. It is virtually impossible to get the Rat King Catalyst upgraded, solo so teamwork is mandatory to some degree.

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