Maybe a strange build concept, but which should be working great in a scenario, receiving multiple attacks, so that Aegis repeatedly procs. I haven't tested it yet, but I would like to know, what you think:
The essence is using F3 virtue of the willbender, which can provide a lot of Aegis and honor trait line, most importantly the trait "Pure of Heart". If Aegis procs many times, the player basically is immune as long as F3 is active, due to the healing coming from "Pure of Heart" and no ICD.
Pair it with "Mystic Rebuke" from zeal traitline, blocking multiple hits and proccing "Shattered Aegis"...should be worth a try.
Another alternative to zeal traitline could be choosing the traits "Might of the Protector" (for a lot of might while under F3) and "Tenacious Defense" from valor traitline, which could provide quicker reaccess to F3 virtue.
This is the basic idea, you go figure out the details 🧐
Looking forward to your responses!