Skills in Campaigns(Is that how you spell Campaign?)

I have but 1 single question

Can you buy skills that are in prophecies in factions or Nightfall.

For example Animate Bone Fiend is recieved by a quest or Skill trader in Doknar's forge(The quest and skill trader are both in prophecies) Can I get Animate bone fiend in factions or nightfall by buying it or beating a quest? This would save me a lot of time.

I have 1 friend telling me you can get it in factions and nightfall and another saying you can't, which one is correct?

well, animate bone fiend is a core skill so you can get it in all campaigns ^^
if you have all three games and unlock a skill via either pvp faction or simply by buying it with another char of the same profession you should be able to buy it at any skill trainer
example: Mystic Regeneration is a dervish skill which you can buy at the last skill trainer you meet in nightfall. I wanted the skill when i first made my dervish so i went and unlocked with Balthazar faction and viola! it was available at the skill trainer in kamadan ^^ now we also have tomes to give us already unlocked skills ^^
hope that helps

Thanks, so does this apply to all skills or atleast skills like blood of the master and others(non-core)

Thanks Alot Man You Just Made Me All Warm And Fuzz Y On The Inside

To unlock non-core skills, you have to have the campaign they come from.