Thread:Zannia/@comment-173.30.185.241-20130321142919/@comment-1321146-20130321194008

First:

Event Specialists are only Event Specialists for one Event, typically. The only Event Specialists for this Event are Hel, Agni, Atalante, Nemea, Ifrit and Elemental Shaman. You can tell if a card is an Event Specialist for the current Event, as it will have a special "glow" on the combat screen. As you can see, there are Event Specialists from all rarities, and the very first 6-star base card is even an Event Specialist.

Yes, as you progress you will fight harder monsters, eventually they will be impossible to kills alone without the use of potions.

The Premium Key may grant any monster, but the rarer they are the less likely they are to appear. Getting two of the same card from a key is only possible with the Superior Dx Key, not the standard Premium Key, or even the Superior Key. The Superior Dx Key is an event ranking reward, and a reward for logging in for 20 days during the 30 Day Login Bonus promotion.

Finally, I would start selling or sacrificing your uncommon (2-star) cards at your current progress.