1) You can't joing Vargul. You can either join the Plunders or the Tinkers, but not both. (Plunders=Warrior, Tinker=Wizard, IMO). Just go on and kill Vargul, if you like. He'll never talk to you, as far as I know.
2) To kill Jungle Lilies (or any plant life, for that matter), fire is best to use, although any storm spell should take them out. Firestorm is best if you have it, but flamedrop repeatedly (or Burning Haze is better) stops them dead in their tracks while they're getting fried. Best to get them in a long hallway and stand way back out of their range, firing spells at them.
Hope this helps!
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