Concordant Opposition

Concordant Opposition
This item is imbued with the energy of concordant opposition. Those who rest at the pinnacle of supreme balance can do nothing but gain. When the wearer of this item is successfully attacked in melee, there is a chance that the item will bestow temporary hit points grant spell points to the earer.
 * a 4% chance to gain 30HP, and a separate roll for a 4% chance to gain 30SP

Stacking
Currently weapons and accessories do stack, while accessories themselves do not stack. This is probably not working as intended and might get changed in the future (see developer posts below).

Developer words on the topic
"It's a 1% chance to gain HP, and a separate roll for a 1% chance to gain SP. So, you do have a 1 in ten thousand chance to get HP+SP on the same hit :)" - DeadlyGazebo

(Player: Shouldn't this be increased to 5%?) "A 5% proc rate would be extremely imbalancing if you wore eight of them." - Eladrin

"No changes have been made to Concordant Opposition items since Piloto increased the proc rate from 1% to 4%, and increased the amount of spell points granted when it triggers." - Eladrin

"I'm actually not 100% certain on the stacking nature of Concordant Opposition, as Piloto created it, not me. With a prototype system, we're likely to err on the side of caution at times, especially when it's related to something we normally don't do (like SP healing). We'll be tracking all the information we receive from it, and are very likely to make adjustments to things we find too weak or excessively powerful." - Elradrin

(Player: I also want to know if the weapon + accessory stacking of CO (as it seems to be currently from all the testing data I have seen) is WAI or is it a bug subject to change?) "Guard effects should not stack with themselves, so it would be classified as a bug that is potentially subject to change." -Eladrin