Use Dweb on necro.. pit monsters are really crappy tbh, not a problem even on p7, for merc get eth insight it is enough ( I find golem useless, it dies too much ). Don't worry about the map, you'll get another one.
Edit: With tough pack use decrep, otherwise amp. LR is worth it on skeletons because they have more psn res, and not really even then. Most of the damage is merc+CE, not poison.
Edit: With tough pack use decrep, otherwise amp. LR is worth it on skeletons because they have more psn res, and not really even then. Most of the damage is merc+CE, not poison.