Thought I'd try Unreal with ENB bloom, Nali Weapons, Thievery mutator, Relics and zombies.
It will not work with zombies (they trigger and kill everything), but it was worth the test just for the fun.
Stage 1: I spawn the Executioner, as I will need them.
enb2012_11_30_1_53_30.png
Stage 2: This is why you need the blades.
enb2012_11_30_2_50_44.png
Stage 3: OK. I can deal with these guys.
enb2012_11_30_3_4_1.png
Stage 4: A few more in the corridor where they killed the scripted Skaarj. Just gotta get round the corner to the final part of the level.
enb2012_11_30_3_4_32.png
Oh shiiiiiiii !!!!!
enb2012_11_30_3_5_2.png
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