Were. Owl. Bear.
Large level 6 troop [BEAST]
Rip and Peck (hybrid form only) + 11 vs AC, 22 damage, and the target is hampered while engaged with the wereowlbear.
Vicious hybrid: If the escalation die is even, make another rip and peck attack.
Owldropbear (one enemy below the wereowlbear) (owl form only). +11 vs PD, 33 damage and the target is grabbed and hampered while engaged with the werowlbear. The wereowlbear transforms into its hybrid form as it plummets from up high, pinning its unfortunate victim down. It’s very hard to intercept a plummeting wereowlbear.
Feed the cubs: An owlbear that scores a critical hit against a hampered enemy tears a piece of the creature off (GM chooses a limb) and will subsequently attempt to retreat with the prize to feed its cubs, likely in its owl form. The torn-up enemy is stunned until the end of its next turn. Does a wereowlbear have cubs? Are they werecubs? Does it just feed a den of bears in a misguided maternal instinct? We may never know.
Bestial fury (hybrid form only): Wereowlbears gain a bonus to damage equal to double the escalation die.
Resilient shifting (all three forms): As described in 13 True Ways, a werebeast can shift forms once per round as a quick action. When a werebeast shifts, it can roll a save against one save ends effect.
Silent hunter: Owlbears are nearly silent until they strike. Checks to hear them approaching take a -5 penalty. The penalty increases to -10 if it is in the owl form.
Moon bloodlust: Expand the wereowlbear’s critical range by the escalation die if it is fighting under the moonlight. E.g. if the escalation die is at 4, the wereowlbear crits on 16+. Note: very likely to result in loss of limb and life. Run.
Cursed bite (hybrid or bear form only): Unlike other werebeasts, wereowlbears do not spread their curse to humanoids, as they never were one to begin with. It’s not even clear if it’s a curse at all, or the true origin of owlbears, or the next stage in the evolution of the ferocious hybrid.
However, they may be able to infect other animals they bite, such as ranger’s animal companion or a pack mule. Unless blessed, purged, or otherwise cured, the bitten creature will turn into a werebeast on the night of the next full moon.
If the beast was land-based, it becomes a wereowl. If it was aerial, it becomes a werebear. What that actually means is left up the GM and/or ranger.
PD 20 HP 140
Bear, Owl, and Hybrid forms
The wereowlbear is not likely to fight in the bear or owl form. It’s quite happy to start the fight in the owl form, though, and it’ll transform into an owl to reposition and perform the owldropbear attack whenever no one’s engaged with it. In the rare instance when PCs somehow manage to attack it in the owl form, decrease its AC and PD by 2 and call it a day.