For Fortnite Season 2 Week 12 Brutus' Briefing challenges, you need to find a SHADOW Hideout. The latter is a hiding place used by the organization of the same name, and whose entrance can be found at different points on the map. These are public restrooms that will take you directly there via a secret tunnel.
Where are the entrances to the SHADOW Hideout in Fortnite?
Public restrooms are easily found in Fortnite. They are in Pleasant Park, and are quite contested. All you have to do then is use them to go through the secret tunnel and enter the SHADOW hideout.
How to use public toilets?
To use the public toilets in Fortnite, there is nothing simpler. As with any in-game interaction, you must approach the object in question. Once done, all you have to do is press the interaction button. It is by default the "E" key, which allows you to do many actions. You will therefore have no trouble easily using these cabins in order to complete the challenge. Using these toilets will take you directly inside the SHADOW Hideout in Fortnite.
Brutus Briefing challenges are tied to the Brutus skin in Fortnite. At the end of the various challenges, you will have the opportunity to choose an organization with the character, giving him an additional style. The cosmetic featured with the challenges changes every week. Thus, each new agent will have his moment of glory.