Fortnite: Save the World is a co-op sandbox survival game developed by Epic Games and People Can Fly and published by Epic Games. The game was released as a paid-for early access title for Microsoft Windows, macOS, PlayStation 4 and Xbox One on July 25, 2017, with a full free-to-play release expected in 2018. The retail versions of the game were published by Gearbox Publishing, while online distribution of the PC versions is handled by Epic's launcher.
 
Recently, Epic Games has released a new Fortnite update for PS4, Xbox One, PC, Switch, and mobile.In this time update, except for bringing a new weapon and a pair of limited-time modes to Battle Royale, it does bring some updates to Save The World modes. For Save the World there's a new set of weekly Horde Challenges and another hero joining. The first change that happen in Save the World is freshening up its challenges.
 

Besides, if you have played Save the World, you may know that in this game, the player takes on the role of one of numerous Heroes with the task of fighting against The Storm, rescuing Survivors, rebuilding structures, and upgrading and expanding a shield device to protect the area. Though the task is straightforward, Save the World offers multiple levels of progression for players to utilize in order to better reach their goal. Therefore, in this update, it adds a new character called Thora, who can lure husk enemies into traps. This comes bundled with a new weekly challenge mode named "bulletproof husks", presumably designed to let players test out Thora's abilities.  
 
Now, let’s take a look at the specific Fortnite update 5.21 patch notes about Save the World at below. There's also a new batch of challenges available for Week 6, including one that has you search where the stone heads are looking and another that has you complete time trials. 
 
Missions + Systems
 
Weekly Horde Challenge - Bullet Proof Husks
☺Features bulletproof enemies that must be defeated with melee weapons, traps, or Hero abilities.
☺One time completion Quest Reward
☺1500 Gold (the Cheap Fortnite Items is provided in mmocs.com)
☺Repeatable quest reward
☺75 Tickets
Removed the Power Rating restrictions on Challenge the Horde missions.
☺These restrictions were blocking some players from accessing the Weekly Challenge Missions even though their Power Level was at the necessary level.
 
Bug Fixes
 
1 Fixed an issue where the modifier between Challenge the Horde missions wasn’t appearing between waves.
2 The Constructor Leadership quest will no longer fail to advance when purchasing the skill tree node.
3 Atlas activation has been fixed in multi-gate Fight the Storm missions.
4 Track completion now advances the mission properly in Level 28 Deliver the Bomb.
    Survivors and quest items no longer appear as orange boxes in the world.
 

Heroes
 
☺New Constructor Machinist: Thora added to the Event Store, which will be available on Wednesday, August 15th at 8pm ET.
☺Fortnite: Save the World gets a bit of love from the update too. It adds a new character called Thora, who can lure husk enemies into traps. This comes bundled with a new weekly challenge mode named "bulletproof husks", presumably designed to let players test out Thora's abilities.  
 
Gameplay

Bug Fixes • Fixed an issue that could cause Rocket Launchers to take up a large portion of the screen.
 
More information and details about the new updates of Fortnite on 5.21 patch youcan find in mmocs.com.