[mysticknight182]

Feather is a spell that temporarily reduces your encumbrance... not for jumping off cliffs (for that, you'd want slowfall, or levitate).

The best way to figure out all the different spells (short of just playing with them) is to consult the small game manual that should have been included with the game when you purchased it. Inside, you'll find a list of all the magic schools, a brief description of each, and then a brief description of the different kinds of spells within each school (i.e. levitate, slowfall, feather, jump, etc. etc.) I found that most helpful, hope it helps you also