See Prathun post https://forums.daybreakgames.com/eq/index.php?threads/ha-what-levels.248045/ Heroic Adventures use the same NPC files for all levels. A scaling system recalculates their levels, stats, spells, and the rewards so that they are appropriate for the level of the zone. The NPCs will recalculate if the level of the highest level character changes. For example: the highest level character leaving the zone, a higher level character entering the zone, or a character gaining a level. The NPCs can technically scale to any level, though the design side wasn't intended to go below level 65. Also worth noting is that as of a recent update the HAs don't scale any higher than whatever the max level was when the content was introduced. ROS 110 would be max but the older expansions would be lower at lower caps
CrazyLarth, so essential it would be highly advantageous to have a level 110 tank grouped with 105s in a Gribble's HA... thanks for the additional info =)
I have said it before and I will continue saying it: HA Scaling is the worst thing to happen to EverQuest since ... ever. More risk for the same reward is the dumbest formula I have ever encountered in a game.
On the flip side, it's such a good idea to help get people caught up in modern EQ. The implementation is just terrible.