New domains

[Atalius]

The domains in the Gods and Magic book, are they only for select Deity's or could say Gorum grab the Cold domain?

[Gamerskum]

If Gorum can have it, then it would be listed under the alternate domain section of his write up on Gods and Magic. Gorum doesn't have any alternate domains.

[Stareyes]

That being said, there is the feat Splinter Faith for clerics and champions that lets you trade out a domain for one that isn't on your deity's main or alternate list, as long as it isn't obviously anathematic to your deity. The downside is that any domain spells from the domain you added are cast at 1 level lower than they'd otherwise be.

[Xenocrat]

Syncretism is the other feat that gives access to other domains if you're a cloistered cleric and pick a god that matches up in alignment and the domain you're interested in.