Catalyst

"For those too lasy to upgrade their sentries manually, this gadget will do it for you. Every 20 seconds, activate it to instantly upgrade your sentry." In-game description

The Catalyst is a slot 2 weapon for Sapper that could upgrade your sentries and mortars for you. But before doing so, it has to charge itself up for 25 seconds. Using it will then upgrade any sentry or mortar that you have placed, and can be activated regardless of range.

i dont fucking know what you call it but it looks like a joystick in cars that changes gears except it upgrades buildings and shit

Tactics

 * m1


 * Pair this with the rainbownator to overcome that weapon's downside of not being able to upgrade buildings with its explosive charges.


 * The Catalyst favors Sappers that often upgrade their buildings, which can be played both offensively and defensively. Although definitely do not pair it with the ANFO crate, as you cannot upgrade that.

Trivia
The weapon's in-game description is still outdated and has a typo despite it being nerfed already