I've fought this ayakashi last night near a lake. It's a human size leopard, 1 eye, 5 claws on each paws, 2m long tail.
This ayakashi uses a big roar to send shock waves. To deflect it, use a defense spell but the strength of it depends on your spiritual powers. Then use attack spell to damage it. Finally, banish it with just 'The army the...' spell.
It's not that fast, so it's easy to attack it.