I haven't done the quest I assume you're talking about with Skaal guy's brother but I did find 2 wearbears up in the snowy part of the mountains at the top of a waterfall...
And *SPOILERS* once you cleanse all the available Stones (not including Tree) you can begin to absorb dragon souls on the island again.
Yup!
*Spoilers*
If you go to Skall Village as part of the main quest line he mentions that cleansing (breaking) the stones it will weaken Miraak's power in your realm and delay his return. If you do this and go to all of the available stones (You cannot do Tree they say because that one is located in his temple or something) you will be able to absorb dragon souls once again. A few of them spawn several lurkers though so beware! Bring a follower or bring a lot of potions if you are playing on a higher difficulty setting.
*Spoilers*
Any reports on Black Book powers? So far I have unlocked the ability to make my Frost breath freeze people solid as well (for a good 10seconds or so I may add), 10% increase in effectiveness of all combat skills, and the ability to NOT HURT ANY FOLLOWER IN COMBAT EVERRRRRRRR WOOT! (With Weapons, shouts, or magic!).
I kind of wish I picked the Fus Ro Dah's perk though because it says it increased the damage and had a chance to DISINTEGRATE enemies.