When I am in arena, i seem to go oom really fast compared to anyone else. I use sw:d on cd and archangel, shadowfiend and dispersion for mana. I am questioning myself, Why do I have to use my dispersion for mana when i need it for being defense and archangel and sometime shadowfiend for being offensive. Are we the only class that has to do that?

If anyone has any opinions of a better way to be more mana efficient or suggestions for a later change possible post here.