Also I forgot to put the einherji abilities they will have to learn to deal with which are 

Enhanced Strength: Einherjar have increased strength from when they where alive.
Einherjar Immortality - While within Hotel Valhalla, einherjar cannot die, but will be resurrected after gaining a mortal wound.
Enhanced Agility: Einherjar are more agile than when they were alive.
Hebekinesis: Due to technically being dead, Einherjar can not age.