When creating armor, keep in mind, above all else: What level the mob you're putting it on is. Armor has the same restrictions with mobs as it does with players. It can't be worn by a mob more than 2 levels below it without running into some errors.

Also, please try not to add more than 1 attribute per 25 levels of the armor. If it's level 50, you could add damroll+wis for instance. No more than 1 wis/int/str/dex/con per 20 levels (i.e. + 5 wis for lvl 100 would be OK) and no more than 1 hit/damroll per 10 levels (15 hit/damroll for lvl 150). Hitpoints: don't go higher than the level (150 hps for lvl 150 is ok, but don't do this on EVERYTHING) Mana: don't go higher than half the level (75 mana for lvl 150 item).

NOTE: ROTF MUD ONLY!! --- Draiko has added an autoset command for armor, once you're editing the object, set it up as type armor, then you would type: autoarmor ... you will still need to set the wear locations and any extra's you want (as well as name/desc's, weight, worth)