This feature is not to give us more targets, it is for those really high in level with a sparse fight list to help them with their USELESS GP's. GP's have been in effect for 4 months now, when will they have a real function???
FYI, if you attack a slayer many times in a row, XP decreases at a rate of 25% each 5 fights (meaning no XP after 20). Undead slayers give half the 'real' XP, not the maximum, but their XP doesn´t decrease since your attacks aren´t added to the usual 40-limited attack count. So, let´s say a slayer gives you 130 XP normally. You attack them 10 times when they´re alive and they start giving you 65 XP, then later on that day they´re 'undead' and you attack. They´ll give 33 XP, but the XP will remain constant until you hit the 'living' version of them. And I agree with Blood, GPs are useless now, and also faction drama makers, since everyone needs to be active for nothing and that creates conflicts. I´m still waiting on news about that.