Guild Wars 2

Illusionary Membrane applies 2 seconds of Protection whenever you gain regeneration. So, a source of regeneration that constantly re-applies it (such as healing turrets, seeds, and phantasms with the Phantasmal Healing trait) would provide near constant Protection? Or does it have a hidden cooldown?

No hidden cooldown but the Phantasmal Healing needs you very close to your phantasm to be triggered and the regen tick is every 10 sec or so. Same for turret (5 sec).

Anyway. That’s a very good trait because it’s mandatory (minor) and also works with chaos armor.

i remember seeing a video where a guardian and mesmer were rolling together in spvp, and the guardian + phantasm regens were procing the protection on the mesmer like crazy, so he was getting the 2s protection boon every 5-10s or so… mesmer beastmode engaged!

iDuelist applies Regeneration from Phantasmal Healing every 3 seconds or so. Stand near it and Illusionary Membrane will give you almost constant Protection.