I think it was since that big update with the Auction House and Advanced training hall first appearing.
I'm guessing a lot's changed since then. If there's anything important I need to know, please do tell. Has piercing damage become more effective (more monsters vulnerable to it).
More variety? Let me know, thank you.
I don't think piercing damage needs to be more effective. It's already extremely powerful against the few things it counters. IMO it's a must have over Shadow damage.
Anyway this may be what you need to know... (in no particular order)
1. Unbinding
2. Adding UV's
3. PvP in Bomberman and Capture Points
4. Two new turret types that deal piercing and shadow damage respectively
5. New Rose Regalia Sets
6. Steam Trading (did I mention SK is on Steam)
7. Accessories
8. New Danger Rooms
9. Candlestick Keep, new undead-themed stage series