For users that own a license for both Omnisphere and Keyscape or Trilian, you can load patches from the Keyscape and Trilian library within Omnisphere. You will also have access to the exclusive Keyscape Creative and Trilian Creative (previously Trilian VIP) library that is an exclusive patch library that blends sounds from both Omnisphere and the other instrument.
Another benefit of using Keyscape and Trilian within Omnisphere is that you gain access to the vast features, FX, and synthesis engine of Omnisphere. This integration largely expands the creative possibilities of Keyscape and Trilian's sample libraries.
For detailed instructions, check out the Omnisphere 2 Reference Guide article on Satellite Instruments in Omnisphere