Fuse haggibah to complete web of corruption or first key leggo?

I was lucky enough to pull rhaia which puts me in a spot to complete the event and get the mythical relic and all the other perks. I was going to go for Gnut or wixwell but now I'm not sure.

I'm early mid game and I imagine the Gnut would change my account the most but it's a rare opportunity to get the relic.

Any input from more experienced players would be appreciated on how you would choose and why.