Inside the tent you will find Zordral and his soon to be victim Bentha. Choosing dialog options 1, 1 will taunt him into attacking your party first. Zordral casts Sleep, Blindness and summon Monster on your party.
Once Zordral is dead, talk to Bentha. You can ask for a trinket or say that good deed is reward enough. This yields you an Antidote or Potion of Heroism respectively.