i cant seem to beat shiva xD

I am lvl 24 and 25 on all characters(way more then the 21 i was when i first tried)

i have stupidly bought 2 types of swords together with the ice shields.. the two swords being flareoron and lothorien or something like those names.. I have 1400-1900 hp each.. and only one quickening..

furthermore i do about 250-500 damage.

most characters know curaga and cura.. but the only have around 100 mp

sword strikes against the blizzard guys seems to be immune..

any help would be great