then dont worth to use beast of doom? normal beast would be the same? o.O

What are you talking about? Have you read any of the replies in this topic? Normal beast doesn't have DS, so obviously it would have lower chance to DS.

With normal grief (20 ds), normal beast (no ds) and HL+gores (50) you'd have 70% DS when hitting with grief and 50% DS when hitting with beast.

thx TheBe now i understand =). my english is rly bad, i try to understand all what u say. now i understand =)