The second suit upgrade you're going to grab in Cataris in Metroid Dread, the Diffusion Beam will allow you to make large impacts to terrain in order to blow holes in walls at special locations and deal huge damage to foes.
Metroid Dread - Where is the Diffusion Beam?
In order to fire off the Diffusion Beam you'll charge up a shot as normal by holding in the 'Y' button until it's ready to go. This upgrade is acquired by successfully beating the game's second boss and, luckily, we have a guide prepared and ready for you to follow that will help you beat Kraid.
You can also check the map below to find out whereabouts in Cataris you need to reach in order to instigate this boss battle:
This guide is part of our Metroid Dread walkthrough and guide series, which includes all ability locations, all missile tank locations, all energy tank locations, all energy parts, all suit upgrades, all power bomb tanks, plus every compatible amiibo unlock, E.M.M.I. and boss battle tips, and other helpful tips to help you get through the game and get those post-game unlocks.