The last tome is in an alcove that opened when you pressed a lever in the hallway with those areas of blood-splattered floor. The lich's heart is a bit more difficult to get to. Remember that area with all the red brick and the ramps to various levels? There's a part that's got a rather hard-to-see elevator. You have to walk along a ledge from the ramped area until you see a part below that has a jagged ledge really hanging out above the pathway. Jump down onto that. From there, you should be able to see and get to the lifts, which you will take all the way up to the top. The lich's heart is on an altar in a room up there. (yes, I know, this doesn't make much sense)
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