Anyone know how to ultimate enhance characters~

Ultimate Enhancement is a meticulous process that consumes a 6-star hero or the material Leah to expand equipment slots. It's a wise choice to prioritize enhancing single-target dealers for raids and AoE dealers for scenarios. It's good to see you diligently focusing on growth, as you have been for a while, hmm!

I've received the material Leah as a reward multiple times, and you can unlock it with two of them. Try running your farming runs while also keeping up with the event.

It's possible with a 6-star Leona. You need 2 equipment slots and 5 unique equipment slots.