Your whip control is absurdly honed creatures that can perceive pain are stunned on a crit. Whip damage does not break charm effects against otherwise hostile targets unless it causes the bloodied condition. You can use a whip attack as somatic components of spells. If your whip is made from a creature that can cast spells it counts as a focus. Your spell modifier can be applied to a cantrip called (whip reference like snappy or crack this) with equivalent strength. Some touch spells can be used through the whip. Metamagic can be used to silence your whip casting subtle spell continues to effect your whip for 10 minits.  Your whip adds 1D4 X 1\5 of your level of PC thematically appropriate damage.