Whisper is severely outclassed, as is sorcerer (also, sorcerer is misspelled). Fighter actually could use a nerf to balance things out. I suppose I could best suggest increasing the relevance of non strength stats.
Also, the bleed element is a little out of place, and might do better as an ability all on its own. Perhaps "Impale - inflict 50%STR plus 120%SPD while adding a layer of bleed to the stack" and "Magic Dagger - inflict 50%INT plus 120%SPD while adding a layer of bleed to the stack"
Inclusion of both of those moves means that players can strategize a speed based class, which would give the speed stat more function.