The Abhorsen house from the Old Kingdom book series by Garth Nix.
The enchanted house sits atop a raging waterfall that defends it’s boundaries from the attack of the un-dead, brought to life by ‘Free Magic’. The water quells the use and effect of Free Magic and makes the island a safe haven for the Abhorsen family, whom are users of Charter Magic.
Charter Magic is the pure and un-tainted magic that runs through all things in this series. It is inherently used for good and the Abhorsen wield bells infused with this magic to return the undead to the afterlife.
Users of Free Magic (Necromancers) usually have less than good intentions and eventually become corrupted by it’s power.