I mentioned this, before:
Disturb the Dead. Adds decent loot to tombs, but at a cost: the dead are aware of your pillaging. You'll be attacked frequently, and cursed, lowering your attributes until you purchase special potions at a temple. Makes tomb looting more of a challenge, and will eventually be merged with another project by the same modder to add an additional 4-5 levels beneath each tomb, complete with 20+ level undead monsters.
The same modder, Zappara, has finished his other project. It's called
Tombs Expanded, and it's a blast, with thousands of spawning points and monsters up to level 60 or so. (In the deeper levels. You're much safer on the higher ones.) Here's what the author says he has added:
"4 Bats
38 Ancestor Ghosts
44 Greater Ancestor ghosts
51 Wraiths
4 Poltergeists
67 Revenants
70 Greater Skeletons
17 Bonewalker
33 Bonelord
69 Lich
66 Greater Lich
463 Total new creature sub types
These creature types have different prefixes / suffixes. Each prefix/suffix <creature type> can have multiple variations ie. usually different loot / different stats (the number 1200 comes from this). Also my mod adds Tribunal + Bloodmoon undead creatures to the new dungeon levels."
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There's a lot of combat action just around the corner, now, if you ever get tired of buying, selling, reordering your home mod and putting books on shelves. I strongly recommend both mods. You can get 'em
here.