Has anyone gotten these 2 to work?
I went through all the ID's doesn't seem to be any conflicts, but now when I load it, I get an error with RP2.
I haven't tried it with Ultimate, but I have tried it with (somewhat heavily custom, admittedly) Direwolf20. RP2's automatic id allocation system is buggy, but DivineRPG tends to conflict with a lot of other mods as well. The single main reason why, is because DRPG uses a very large number of individual block ids, rather than using 2-3 blocks and assigning the rest as damage values of those 2-3, like most other more modern modifications.
I went with a Legendary Beasts, Ruins, and Better Dungeons combo as a substitute, and would recommend the same to others. Better Dungeons in particular leaks memory like a sieve unfortunately, but that is fixable by adding -XX:MaxPermSize=256M as a parameter to Java.