Damn, wish I would've noticed the St Lamia thing 2 days ago. Hopefully I can run it a ton today before it ends. I really wanted to run some metals today to level up some units, but I've been struggling with team size and this is just what I needed. Already done 2 levels this morning.
Level 100 would give me an additional 26 cost. I think that'd be enough to get my 6* Ronel and maybe a 6* Vishra (wish I had a better fire unit) into my regular squad.
Edit: Would Lunaris be a good replacement for Lira in a rainbow squad? Trying to figure out what would be the best (have Lira x2, Logan, Lunaris, Lico, Shida, and probably some other garbage).