Originally Posted by wiki

Regarding maintained enchantments: When an ally casts a maintained enchantment on a target and other allies cast the same maintained enchantment on the same target, the following happens:

* The enchantment ends when all maintainers stop maintaining it, or when an enchantment removing spell destroys it, in that case all maintainers stop maintaining it.
* Enchantment effect on target is determined by stats of maintainer with the highest attribute investment i.e. when two player cast Life Barrier on a target, one having barrier reducing damage by 50% and the other by 52%, damage on target is reduced by 52%.
* The enchantment effect on casters works for each caster independently; thus Essence Bond will give energy to everyone who maintains it on a target when the target is being hit, and Life Bond will damage everyone maintaining it when the target is hit, but each maintainers damage is reduced by the amount which is determined by his investment in Protection Prayers.
* The end effect of a maintained enchantment can trigger multiple times if multiple people cast it on the same target.

Unmaintained enchantments work similarly:

* When two copies of the same enchantment are cast on a target, the duration is reset to the higher duration of the two; either to the remaining duration of the already active enchantment, or to the longer duration of the new enchantment.
* When a weaker enchantment is cast over a stronger enchantment, the effect of the stronger enchantment lasts as long as stronger enchantment lasts.