Does the frost cloak spell slow all enemies in range? If they are resistant does that only effect damage or slow effect also? Can u have fire and frost up at the same time? Any lastly, what Lvl does your destruction skill have to be to buy the spell tomes for these spells? Thanks to anyone who can help with these questions

http://www.uesp.net/wiki/Special:Search?search=cloak+spells&go=Go&nsnum=134&redirs=1&searchtitles=1