Stats for ToI

[Cesura]

Is it known what the actual stats, gear and such are for the AI opponents in tower of Infinity? 

I'm trying to improve my score, and I'm not sure which stats and gear I should be working on specifically for tower of infinity.
At the higher floors, pvp gear with hp and crit defense seem to help against the classes that try to DPS you down like summoner and destoyer, but I'm not sure how much is actually needed for tower opponents. 

For that matter, do tower opponents have crit defense? About how much def do they have? 

Should I be stacking pierce or crit for better DPS in the tower of infinity?