Amphories are hybrids between harpys and nymphs. Amphories have horns (most short,every kind of horns are viable), wings with 4 claws, a tail with a featherd end, bird legs, two pairs of sharp fangs in the upper and lower tooth row and elf ears. Average lifetime of an amphorie is around 600 years. 
The female amphories have poisenous claws which hamstring their victim. This kind of poison isn't deadly. Amphories love the human meat, but they can keep themselves alive with vegetables, fruits and mushrooms, too. Animal meat is like poison for them and makes them weak and ill.
Amphories hunt humans by seducing, poisoning (just the female ones) and kill them.
If they like their victim,the nymph part awake and they make love to them, befor killing. If a female amphorie gets pregnant, chances are 99% that the child will be an amphorie. Same applies if a human gets pregnant from a male amphorie.
The most amphories live alone, but few amphories live together in something like a village in high trees. It's like a bunch of treehouses. Its rare that amphories want to live down on earth.
To defend themselves they can scream very loud. An intolerable, high scream. The scream of the male amphories can be so loud that non-amphories get hearing loss.