I always loved the Eclipse caste effects for that mythic vibe - for me their diplomatic immunity effect is also just brilliant for this. Eclipse characters could do an Orpheus and walk in to the most dangerous places around, bargain with the scariest of the scary, and walk out unharmed, it was in the rules. No roll required to activate (though lots for everything else that happens as a result of trying something like this). Welcome to the Eclipse caste - here's your "HERO OF LEGEND" card, get out there and in the faces of the mightiest of the mighty. That blew my mind a bit when I read it.The Eclipse anima effect requires being party or witness to an oath, and flaring the anima as the oath is sanctified, preventing any party from breaking it lest they suffer a horrible curse. I like the handling of it as a series of botched critical rolls, and is a clever way to keep a mythic tone where oaths are held sacred above life and duty.
One of the downers for me about 1st edition was that the Dawn caste effect was the only other caste power that felt like it had anything like the same weight.