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...AoLS, which I didn't really want as I figured that the increased danger level...
...wearing an AoLS and anything else that increases danger level strongly...
For the record, I'd like to remind everyone that there is nothing in the code (or the tests I did) that supports the idea that the LifeSaved state affects your danger level in any way.
Having ESP
will affect your danger level relative to invisible enemies, since you're able to see them, and as a result hit them more reliably, eg. having ESP means stronger
invisible enemies will spawn, but won't affect others.
Since danger is based on how many hits it would take for one character to kill another (on average), and LifeSaved doesn't do anything to change that, it doesn't actually have an effect on danger.
For Petrus, I'd clone up as many wands of telportation and striking as possible and try to keep distance from Petrus. The one time I did manage to kill him I did it this way, but ran out of charges and had to melee him for the last hit.
You could try Batman?'s approach and make a giant pile of wands and explosives then lure Petrus onto it to kill him in one shot, but I'm not sure if you have enough left at this point.
I'd suggest keeping ESP (or ring infravision + AoLS if you want to be safe) around until you deal with the head guard and mystic frogs, but swap in the AoLS before getting close to Petrus or Inlux, just in case.