Adept - frost atronach, revenant
Expert - storm atronach, dremora lord, dread zombie
Master - flame thrall, frost thrall, storm thrall, dead thrall

Also a few banish spells and bound weapons.

I went to that books seller and didn't see any of the thrall spells?

You need to be level 90 conjuration, then ask 'is there anything else to be learned about conjuration', he will give you the master ritual quest. Do the quest, then you will get the flame thrall spell and have the option to buy the other thall spells from him.

oh ok. Thanks!

Alteration isn't viable because you ONLY survived 5 hits from a deathlord on master? I'd say that's damn good! Gives you more than enough breathing room to run away and heal.

I think you miss the point, he had 1000+ health so 5 hits isn't very much. But that information isn't useful anyway as it wasn't tested with the mage armor perk active.