And here I thought AST was not desireable because of missing oCG for emergencies and abilties to boost healing and mp conservation. My bad.
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It's likely to be a bug that will be patched, but yes, the Regen effect is currently separate from the mitigation effect. That means that upon placement, you get the Regen effect for 18 seconds, and if you get the server tick at the end and move back in, another 18 seconds. You also retain the Regen effect leaving the bubble.
Essentially, it means if you let CU do its whole duration and everyone stays to get 36 secs of Regen, it has an effective Regen potency of 1800. AoE. And can be increased with Time Dilation and CO.
Benefic and Benefic II got a potency buff to match that of a whm but the mana cost remained the same as before the patch. Along with luminiferous Aether + Celestial Opposition and random ewer's i don't think astro will have much mp problems.
The fact that astro now has an instant cast version of adlo that is significantly better 90% of the time makes me want to quit.
Except Astro now provides better mitigation than scholar in almost every circumstance. Their adlo is stronger, their succor is stronger, their sacred soil is better, and their buffs probably outweigh selene now.