I made a small mod pack for those who don't really want to engage with a narrative quests, but just want to kill swarms of enemies.
I hope these quests are simple enough that people feel they can edit them or use them as a template for enemy waves.
Demonic Waves in particular allows you to create a tier of rewards for how far you get. 
Some quests exist twice so that a different guild can use them.
These are not elaborate story quests, they are just for when you want to fight waves of monsters. These quests make me think of Doom.
I hope someone can use this to make their own gauntlet of challenges.

schema: *name, group, membership, minReq, flag, notes

GP000Y08, MagesGuild, M, 3, 0, Cult Ritual - waves of gargoyles and sorcerers at a cult shrine
GP000Y15, MagesGuild, M, 3, 0, Hallows Evening Curse - waves of halloween monsters at a cemetary
GP000Z15, MagesGuild, M, 7, 0, Demonic Waves - waves of difficult enemies, greater rewards for getting further
GP010Y01, KnightlyOrder, M, 0, 0, Retribution Force - waves of sorcerers at an exterior coven
GP010Y09, KnightlyOrder, M, 1, 0, Castle Storm - waves of gargoyles in a castle
GP010M15, KnightlyOrder, M, 1, 0, Necromancer Sect - kill one of 4 necromancer leaders, greater rewards for killing more
GP030Y08, FightersGuild, M, 1, 0, Castle Storm - waves of gargoyles in a castle
GP040Y08, HolyOrder, N, 0, 0, Scorpion Swarm - waves of scorpions at a scorpion nest
GP040011, HolyOrder, M, 1, 0, Mummy's Curse - waves of mummies
GP050Y30, Witches, N, 0, 0, Hallows Evening Curse - waves of halloween sorcerers at a cemetary
GP050Z15, Witches, N, 1, 0, Demonic Waves - waves of difficult enemies, greater rewards for getting further