Shamans view magic as a living force to which they can connect through a a patron called a totem. If you choose to play a shaman, you must also choose a totem. Beginning adepts cannot start with any more than 6 Power Points. MS is the Magic in the Shadows sourcebook. See p178 SR3.
Target is the target number of the spell.
Spells that inflict or heal damage have a variable Drain Level based on the level of damage the spell may cause or heal.