So far while facing the Liches in this update, I've noticed two spells that are blocked by their mantle of invulnerablilty, yet they shouldn't be. I tested both of these spells in EN MoD against the Abbott by firing them off about 40 or so times.
Disintegrate - The weird thing is I've had this work against Liches in the past, but it has been sort of hit-and-miss. With my tests against the Abbott in the new raid on EN, I was able to hit him with it about every 10 attempts or so. The rest of the tries were blocked by mantle.
Sunburst - This just flat doesn't work. I've never seen it do damage to a Lich. I tried it in the raid and got only Shiradi sonic/force damage. Once or twice it came up with the light damage above the Abbot's head as 'Immune'. The rest were blocked by mantle
The annoying thing is that disintegrate didn't show up in the combat log, and sunburst only showed up about three times as "You begin to cast sunburst". The only thing that appeared damage-wise was the notification of those times when I hit the Abbott with disintegrate successfully, and the occasional Shiradi sonic/force damage.
These spells would be very useful to certain classes against liches, and it would be nice to see if we could get them fixed at some point, since they are above the spell level requirements to hit through Mantle. Feel free to post any other spells I may have missed.
-Jayron