Prophet's is an item set which can be acquired from the Level Up Advisor at various levels. At levels 9, 15, 25, and 41, you have a choice of set weapons in fine, superior, epic, and superior quality, respectively. At level 33, you have a choice of superior set chest armor, and at level 47, you have a choice of superior set rings. Note that while the full bonus of this set is received from only one item, it is still technically a set, and this means that you cannot receive this bonus more than once, even if you equip more than one of these items.
1 item: Adds 28-1206 Maximum Health