Got my invite last night, and am currently half way to rank 4. How is everybody doing at this so far?
Frost has made every fight a joke so far, I see a lot of Mages going fire at the higher ranks though. Millhouse I am excited to face sometime, thinking just waiting for the damage buff to get extremely high, then doing a Pyro/Alter time for a very high combustion and that will probably melt his health pool.
On Slippy if you go frost and just spam Ice lance you are fine. The only other fight that you had to know what you were doing was that Arrakoa bird, instead of kiting him, you stack on him and let the tornadoes run into him. Oh, and watch out for the Scarlet Monastery guy in the early fights, he hits like a truck so you really need to kite well.