Whenever you kill an evil wizard, there are three things you should remember:
Kill his bodyguards and sidekicks *as well*,
Steal *all* his treasure,
Have an escape route planned *in advance*.
So ... Second time lucky?

A second chance arrives for Cullan and his companions to loot the Tower or Morss - not that they really want to go back there, after what happened last time. Especially with an invading army in the way. Oh, and having to kill the three most well-protected people in a besieged city.