I've been playing around in a custom made FTB equivalent pack containing nearly every mods from the FTB spreadsheet (https://docs.google.com/spreadsheet...T2dnQVMySHdrS3c&single=true&gid=0&output=html) for some testing. I've noticed something kinda odd when I went exploring the Twilight Forest. Pretty much every Hollow Hills I have encountered are filled up with marble. Even the Hydra lair that I have found had some marble partially filling it (the lair is in a crescent shape normally. For me, it was nearly a half moon shape cause of the marble).. I dunno if I was just unlucky, and perhaps there's just a terrain gen compatibility issue with RP2 and TF but I figured I'd mention it. If anyone else tries it out, I'd be interested in hearing your experiences with that.