Quote Originally Posted by Donjo View Post
Oh the horrors of exact words. I do hope that someday they add "abilities" to that description as well
I don't know if you're sarcastic or serious, but there goes:

Actually if you look at the tooltips of each "action" you'll find a small beige colored (yellow/orange/darkpink? whatever!!) text saying: "Weaponskill" or "Ability" or "Spell". You can find this text RIGHT UNDER the ability name in the big test at the top-left corner of the tooltip.

Simply:
  • Most abilities are oGCD. I can't think of an exception.
  • All weaponskills are GCDs and usually cost TP (Only exception to my knowledge are WAR's wrath moves) and are affected by SKILL speed.
  • All spells cost MP. Some of them are instant GCDs (Flash, Ruin II, Unmend), but most of them have cast bars. Regardless of instant or cast, they invoke the GCD. Both cast and GCD are affected by SPELL speed.

So the difference is "added" in the descriptions.