Quote Originally Posted by Slipperychicken View Post
How big is it? They could do one of the following:
My favorite solution? Incapacitate the lich (using antimagic shenanigans as appropriate), and strap him to his phylactery-bomb (or at least within the blast radius). Tell him that if he wants to survive, he must tell the PCs how to defuse the bomb. If the bomb detonates, the lich is destroyed forever. If the bomb doesn't detonate, tell the lich he gets to live in prison or have some chance at continuing his existence. You could also try Mindraping or Probe Thoughts-ing* the lich if he won't tell you.
No, what you want to do is incapacitate the lich and strap him to the phylactery-bomb, then gate/portal/teleport them into the Abyss, and detonate it. While making an appropriately cheesy one-liner, like "You're fired!"