I found the question of them getting drunk to be interesting, because when it is first mentioned that Sand Masters don't drink, Kenton makes it seem like there are serious consequences.
“Oh, that’s right,” Delious said with a smile. “Sand master’s don’t drink, do they?”
Kenton shook his head. “It does . . . strange things to us.”
But then Drile and his buddies are drinking wine freely, just a few days before his battle to the death with Kenton.
Wine was flowing freely, even though sand masters weren’t supposed to drink. Women had been brought to the room, and
Drile’s supporters were enjoying a period of loose debauchery.
Could the "no drinking" thing be another lie from the mastrells, similar to the overmastery thing? Interesting to note that there are exactly three days after the party, so could the effects only last as long as overmastery?
(Edit: I can't figure out how to properly format these quotes, can someone help me? Thanks!)