It seems to me that the devs have no idea how to make proper events. So far this is the second event I got since I started playing and first was bugged as hell + pretty much impossible grind and hard battles almost right from the start.
Now we have an event where I havent encountered any bugs so far but still we have pretty much impossible grind where if you are really active and manage to get one of the more expensive thing out of all of them you will be lucky...
Seriously what is the point of releasing who knows how many rewards in the event when even the most hardcore players will save up enough for maybe 2...unless they pay some serious money.
Not to mention it is pretty much aimed for old players with strong teams who can clear everything easily...
I can clear the lvl 11 with 3 lvl 70 +- maidens (2 of them basic ones (healer and that nature girl with dmg+heal skill and purple orc girl) and one over lvl 50 (frost mage) but it is pain in the ass because there is so many healers and aoe damage which brings your whole team down to low hp very easily.