Restore Life doesn't work on dead 55 builds for some reason. Some sac necros (minion factory builds) take advantage of that.

The only way to res a dead 55 build is to use a res sig. The only thing that really threatens a 55 build tank in the UW is the dying nightmare creature, which uses rend enchantments. The creature dies very quickly (two or three wand hits usually kill it), so spell breaker is more than enough. I carry a res sig with my two man UW farming build necro only for emergencies, as the monk really shouldn't die barring lag or an interrupt.