In regards to
Atugia's
Runic Berserker Set in the sense of an damage
Set it doesn't help much towards that goal for using an defensive Ultimate as she will probably not be the prime target for the shield to have any worthwile effect other than shaving of (in an slow/moderate time in most of the cases) about ~265 worthwile of damage at level 8.
Probably if
Shell were to be swapped for
Berserkergang (as it also fits well in that theme, as she adquired the
Set through the inspiration of seeing orcish beserkers at the
Kervus Warcamp).
Or an new Ulimate
Power wich would be
Targeted Shell (an modified
Shell without the threat gaining component and instead would allow her to choose an allied target for the shield).
As the only uses i have found for
Shell were to mitigate damage (wich as not being an Tank wich the latter probably would have more need of big emergency shieldings than an damage dealer wich could easily wait to be healed) or if damage was not sufficient to push
Atugia into triggering
Frenzy it could be used to trigger it (so if
Atugia had already triggered
Frenzy this could potentially [only if disrupted and needed to be activated again] lose this benefit) .