Spoons as a trade-in currency, Spoons + Sunless runes as a trade-in currency, 250 of them, 500 of them, I don't care.
I'd rather kill Tequatl 200 times knowing I'll get it in the end than doing him 100+ times and getting absolutely nothing.
Sunless skins are perfect for Necros and for some are pretty much the ONLY choice. Don't lock them behind stupid RNG. It's been years now, please change it.