Defiler clerics are meant to function like an offensive, AOE and necromancy focused version of the healer cleric.
However, unlike the healer cleric, they can only gain overhealing by closing into close combat with their enemies. This means their temporary health helps to earn more temporary health. But there's an issue. Unlike the healers, who can simply cast another cure spell to extend their duration, a defiler has no easy way to extend the duration of an overheal, so that it might last to the next battle, from the previous. This is an issue that impacts both their team-play and solo/self-support abilities
It is for this reason that I feel that defiler overhealing should be buffed, specifically and exclusively in duration.
If we redesign the defiler to be a little more longlasting in their ability, they become a more capable vampiric healer, taking the ease of the tail end of one battle to use as an advantage on the beginning of the next. I suggest that the duration should be 1 round per cleric level. This would allow, at higher levels, two or so minutes to get to the next battle. I think this duration is already more than earned by the risk involved in obtaining the overhealing in the first place, and the difficulty in getting enough to heal the party at large, but obviously balance tweaking may be required
