Crawler class of stealth and larceny; Dante's class, carried to level eighty-nine before he took a deal.
Thief is the class Dante ran during his own crawl, and his record lists a top level of eighty-nine before he took his deal at the beginning of the eleventh floor.
The class shaped his Indentureship as well: he was first posted to the Lockpicking Guild, the obvious fit for a thief, before applying to move to the Trap Master Guild to be near Justice Light. The two disciplines sit close together in practice, and so do the guildhalls.
Dante's crawler class, and the reason he was first assigned to the lockpicking guild.