I Run Mausoleum since long ago and i can say that majority of player still don't understand the mechanic of Corviss the Lich,

it is very easy once you know

When Corviss have Purple shield all party need to stand in the white pool, break the shield and go out (the pool don't kill you, it just decrease your hp alot)

When Corviss have White shield all party need to stand in the purple pool, break the shield and go out (the pool don't kill you, it just decrease your hp alot)

If you don't go on correct pool your damage drop to something like 10, so don't even try to attack its useless,

Thank you and correct me if i miss something

PS: It is a very good idea to deactivate auto-health potion when you fight Corviss for obvious reason!

-Hanumanx