New worlds with day and night(Fast World rotation). Full daylight -> Full darkness with varying light in between. Day time fighting would be easier more solable. But you must to enter "some" caves and covered passageways to do the quests though. Night time or darkness requires more of a teaming environment. Have vicious night time "hunters" that can random attack hit and steals your mana to heal. Once you enter their "hunting" ground they track you or your group and wait until near darkness to attack. So you can wait until daylight or risk it. The reward for defeating them is "random" amount of mana and health and better items reward and XP. You do not know what the hunters school and level is until the fight. Makes you keep your best gear on and converts, The normal Hunters are not bosses but they have a good amount of health, and sharp claws and teeth(pierce), maybe a few have poison to reduce hit your strength during the whole fight(weakness). Hunter groups are random schools within a group. So now wizards must keep "them" bottles full. Pets sleep more at night and only awaken in the middle of a tough battle. During the daytime I would not want to enter a Hunters Cave. They viciously defend their warrens, against all, you might be smarter to wait until night time when they are stalking you. Then at least you only need to fight a few older "more" treacherous ones(Bosses), and a few lowly weak minions, but don't take too long. How does this work, random fighting areas along the trail normally during daylight contain lowly mobs, but at night the lowly mobs flee when the hunters come. You do not know where and which area they are in. but you will hear them near, Hunters growling over food, prowling(snap of a branch), or maybe it was just the wind. So you can get a regular mob or a hunter type at night. I would prefer a 4-4k+ mob then the 4-10k+ hunters.