Yakov

What we know

Claimed to be humble hunter from Krezk traveling Old Svalich Road with companion Razvan (Session 13 @ 01:01:59)
Warned of red-haired woman with wand that blows holes in chests (Session 13 @ 01:02:51)
Lied that wizard tower did not exist (Session 13 @ 01:11:27)
Transformed into werewolf with Razvan; attacked party on Old Svalich Road (Session 13 @ 01:10:29)
Slain in combat by party (Session 13 @ 01:51:04)
Body yielded spoiled small-game pelts and broken crossbows only (Session 13 @ 02:10:21)
No silver found on hunters (Session 13 @ 01:06:14)

Ambush on Old Svalich Road west of Vallaki during dawn march to Lake Baratok (Session 13 @ 00:57:40).

Unconfirmed: whether hunters served Court of Wolves or werewolf den near tower (Session 13 @ 03:12:15)