Did a little research into Ertel that may help people.
I have searched through wikias and I found this (I google translated to english) :
http://aigis.gcwiki.info/?%BD%A4%C6%...BC%A5%C6%A5%EB
Seems to me Ertel is a cross between a healer and a soldier (Battle Heal I - X seconds attack power Y twice
to concentrate on recovery), kind of like the melee equivalent of a Bishop (Mage/Healer cross).
Also regarding War Priests "Can be stuck the enemy of up to two-body (three when CC) when you are not blocking the enemy, to restore the HP of the ally"
So she blocks and heals when not blocking. Seems a handy unit especially when Ranged spots are limited. Plus you can deploy her on her own and she heals herself when not blocking anything.
(correct me if I'm wrong)