If Boris Ursus is the Army General, any units of Kossars in the army may be given the Mark of the Bear God at a cost of +1 point/model. Models with the Mark of the Bear God gain the Devastating Charge special rule.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
If Boris Ursus is the Army General, any units of Kossars in the army may be given the Mark of the Bear God at a cost of +1 point/model. Models with the Mark of the Bear God gain the Devastating Charge special rule.