Who should I take up to r4 for my first?

LostCrest

I got lucky and got a generic ag from the holiday crystals. I have a r5 CGR already but no herc, doom or ghost. I can take any of these champs up to r3 and decent sig. I just have exploration of act 7 and 8 and act 6 left. And no abyss or lab runs yet. I don’t know if ghost is worth it. I have kitty already at r5 sig 200.

If you have any other options just say them.

Spookyquail

Personally, I would go nimrod or magneto, but from the options you put on board, I think I'd go for ghost