Actually if the OP doesn't mind I'd like to add coils to this topic too.

I'm currently on T11 and my raid don't want me to use Selene because of the Skill Speed buff draining TP. Something along the lines of Bard having to use Paeon will actually reduce overall DPS because he can't DPS fully himself. Has anyone tested if this really is the case? I don't mind using Eos while we're still learning the fight, but surely Selene would be the better pick when we have it on farm?