While doing some arena farming yesterday i found out a quite nice thing.
When you use [Divine Hymn] in the arenas, you will get out of combat even tho that your enemys are hitting your healing target, allowing you to both heal and get out of combat at the same time. This is very usefull too me when im low on mana and need to drink. [Inner focus] + [Divine Hymn]
1 more thing is a trick as a priest to get immune to fear twice instead of once with [Fearward].
When you see the priest coming for you, cast [Fearward] exactly when the other player casts fear and you will become immune against that fear and keep [Fearward] on you. So IF you dont get Dispelled you will be able to "resist" two fears.
There are also a few more things that can become handy, but hey i need to save some for later!