... tip...
You will encounter alot of them Sirens when you're out boating. I'm not kidding. ! ALOT !
Make sure to equip Geralt with the bow thingy. Watch the first 2 mins or so of my gameplay clip.
...oh... try not to hit anything in the water with your boat. Not a good thing to do...
NG+ Death March
Yeah i've killed a bunch of sirens. most of them dont hurt me, but they do tear the boat apart. Common monsters generally just seem to bounce off of Geralt for me. Siren's other wise get annoying on the water lol