Helheim advice

[Festin]

I could not find an actual thread on Helheim in strategy index, so I'm creating a new one. Could somebody please give some advice on playing this race? It sure looks like a F9W9 bless is the only real option for them, but there are still a few questions:
1)Which sacreds/sacred commanders are most effective?
2)What spells are research priority for Helheim?
3)Does it have any kind of end-game strategy, or is it purely a rush nation?

Thanks in advance.