Thx for suggestion but revive is necessary only if you planning to do ubers with sum necro, overall its not really needed 1. Saves time 2. With revive sometimes you get situations that your skeletons not able to do damage because revives are in front. But it might be helpful for killing bosses such as diablo or baal where you cant use corpse explosion, just tele on their head. I'll transfer it to variations depending your playstyle. Cheers