That's how I play. I try to take away someone's strength or wait until they are at they're weakest to strike. Not necissarily a gank situation, but a watch and wait situation. If you're talking about a full A/B/S fucking lich, just who the fuck is gonna solo that motherfucker? I don't know if you remember Ahtieli or Satebos or Istendil, but those assholes DID NOT DIE. It took like 9 people without anti-gank code to finally kill Istendil, and from what I heard his link had dropped.
So all these one man build ideas are bullshit, because they've been tried before. I remember Aarna posting her attempts at Ahtieli with the whole pincer staff drive shit, and in my opinion that's about the closest you're gonna get to a perfect lich/mummy kill build, and she still couldn't do it. Therefore, this whole tread is bullshit, and my point remains. How are you gonna kill a lich/mummy solo? Not with some super rager combo. Not with pincer staff/drive. The only way it's gonna happen is by catching them with their pants down. And in my opinion, the best class for that is transmuter, because it allows you to follow someone in complete stealth for mass amounts of time. If you're clever (sp?) enough then all it takes is timing.
So my answer may suck, to you, but I call all the other answers bullshit. If we're talking about a strong A/B/S mummy or lich then some power combo/stand toe-to-toe shit isn't gonna happen. If we're talking about some fool who doesn't know what he's doing and just lucked out with the quest, then sure, but how many times has that shit happened and if we're talking about a weak mummy or lich, then what's the point of this at all?