Source: House rules, based on 3.5 spell casting mechanics and incorporating ideas from The Complete Divine, page 87.
Instead of making undead run and cower, turn attempts deal positive energy damage to undead close to the cleric.
Turning undead is a standard action that deals 1d6 damage/cleric level to all undead within a 30 ft. sphere of the cleric. If he chooses to limit his focus to whatever is in front of him, the range increases to a 60 ft hemisphere in the direction he is facing. Undead directly above, below or to the side have a 50% chance of being included.
When using this ability against incorporeal creatures, you do not have to roll a 50% miss chance; turning hits them automatically.
The turning process does not provoke attacks of opportunity (PHB page 159), and is immune to disruption. There are no complicated gestures, since the cleric is just saying "Begone, spawn of evil, in the name of my god".
Evil clerics (any cleric that can swap out spells for inflict spells) can instead heal undead within 30 ft. for 1d6/cleric level. Evil characters have taken the time to do additional rituals to give them long term control of undead.
The Greater Turning feat doubles the relevant damage and healing effects on the affected creatures.
These effects also work in the same way for clerics with elemental domains and creatures of the same and opposed elements (Fire vs Water, Earth vs Air). Therefore a cleric with the Fire domain can heal Fire creatures and damage Water creatures in the same way using pure elemental matter instead.
Currently this is limited to elementals and other creatures native to an elemental plane. For example, tritons (adapted to the Prime Material plane, whatever their original plane), merfolk and red dragons are immune, but djinni, efreeti, xorns and tojanidas are not.
I leave open to discussion whether other creatures are affected. Making a red dragon vulnerable to this effect would probably weaken it far too much.
Paladins work just as you would expect, turning undead as a cleric 3 levels lower.
Undead in the area of effect with more HD than double the turner's level (a 4th level paladin is turner level 1) are immune. Evil turners are similarly limited.
The rest of the undead get a Turn check, which works as follows:
Darkness or physical obstructions
Although this sounds a bit complicated, it’s still a 2-step process like the core rules and its mechanics are in line with the spirit of spells in 3.5.
-- PeterShea - 16 Jan 2011