Also, I just found all three words for "throw voice" and have no intention of wasting souls on it. What a waste of time.
Seriously? I have a surplus of about thirty souls and at no point during the game I have needed to gather more souls to unlock the words I already have (except for the very first word you get from Bleak Falls Barrow).
You must simply not be adventuring enough.
I started a new character, I'm level 8 or 9.
Did you manage to kill Krosis at that low a level or did you get your words and run like fuck out of there?
Yep, standard tactic. Wear my archmage robes, Savos' amulet and Morokei for +100 magicka and +200% regen, then use double ice-spike to stagger him and let myself regenerate a bit, then Ice Form for a rest. Luckily I killed the dragon before I got close enough for him to get up, or I would've been fucked.
Also, that tactic is great when you're dealing with pretty much any stupendously powerful human-size character, Draugr deathlords for example (I'm level 9, they're a fucker)