We made some changes to Astral Shield after finding that it was not balanced in line with the rest of the Cleric's abilities, or those of the other classes. At its most OP, some players could simply ignore defensive gear and just stay in the circle, which is no fun.
If a single skill on a single class is up "only" 66% of the time, that's a red flag for us that there may be some balance issues with that skill. We're currently looking into high-level dungeon scenarios where difficulty may be inappropriately scaled, leading some parties to feel like the previous version of Astral Shield was required just to make progress.
We've received a lot of positive feedback about the changes to Astral Shield, and it seems that many Clerics are enjoying all the other buffs and fixes. Astral Shield is still a really good skill, and we're monitoring to make sure that Clerics are just as useful in a group as they're intended to be.
Please continue to let us know your feedback, about Astral Shield and everything Cleric-related!