https://www.gamespot.com/articles/fortnite-update-changes-thanos-yet-again/1100-6458877/

Epic Games is updating Fortnite again to make changes to the limited-time Avengers: Infinity War mode, Infinity Gauntlet, which features the mega-powerful Thanos. Specifically, the update will change his attributes to make him more powerful, but also somewhat easier to kill.

Starting off, Thanos' Beam is now deadlier; it does 20 damage instead of 12. Additionally, punch damage is increased from 80 to 100. Balancing this out somewhat is the fact that Thanos' health now stands at 500 instead of 800.