Cleon
Legend
I'm still standing by CR 1. They are swift in the water, can wallcrawl to get the drop on victims, and only need a single hit to really mess up a 1st-level character.
Oh, if you insist. Shame we can't split the difference and call them CR 2/3.
![Devious :] :]](http://www.enworld.org/forum/images/smilies/devious.png)
1d6 rounds and a blood drain "fill limit" appeal. Stirges "fill up" at 4 points drained...maybe 6 points for a yphoz since they are bit more amorphous?
6 points is OK by me.