You can't lower World rank until you have World rank 5. So don't try that like the others have suggested. To be honest I was in a similar spot because my focus had always been on lore and the main story than the gameplay amd levelling up. You are in no way beyond saving though. Just face the tougher opponents for a while.
What I meant to say is that the rewards are based on the Host's World Level. So seeing as he's hosting and is a lower WL, you'll get rewards based on that world since that's where you're initiating the event from. If you host, you should get your WL rewards and I think he will get a higher WL reward as well. Only way to find out is to test it.
If you thought this fight was going to be a walk in the park with your high level characters, think again. There’s a reason why people with Visions are so scared to confront her – Baal has the
AR45 World level is literally the world level you'd want before grinding really hard for Artifacts though This can be done without doing the WL quest, just got to be at AR 45 to get. Same for Dvalin and Childe lv 80 difficulty. It's generally better to level the WL anyway, but not required for artifacts or 2 of the 3 bosses.
Gamers can use Genshin Impact’s World Level system by employing the following steps: Going to the game menu by pressing escape or start/select (on the controller) Click on the ‘i” on the top
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genshin can you lower world level