Fucking christhammer, 47th try I FINALLY got a Tamadra. So many stones wasted...
And getting it cost me another stone because I stalled for eight turns on Horai (with Verdandi). Turns out that works great if you don't run into a Tamadra, but if you do it's instant death. So... Yeah. Tradeoff I guess.
dear god farming kaguya with ra sounds like a nightmare
As long as you can get past the first floor you're basically guaranteed to win since you can just about stall up all your skills on Horai. And most of the time I did get past the first floor.
Plus it's good practice, which is good.
Edit: Lol, immediate next run yielded another Tamadra. This is karma, I will expect one per run now for like... a while.