Board Thread:Questions and Answers/@comment-67.82.63.221-20121222174453/@comment-4467532-20140207183018

While Diablos' resistances to Ice may have changed, where the element is effective on him however you won't be hitting as often with the weapons that are elementally based. Those places that he is weak to Ice being: Head(20), Back/Wing(25), Wing Webbing(20), Tail Tip(30).

Diablos is however EXTREMELY weak to poison(initial Tolerance of 200, increase by 50, and 125 HP per infliction). And as you can build up poison while the monster is still inflicted with Blademaster weapons in MH3U, poison becomes a very effective weapon.

And while fast weapons work well on Diablos, so does just about every non-impact weapon. The rule of thumb on Diablos is to use something that you can feel comfortable getting away from his charges with, or blocking them with(I can use HBG on Diablos and rarely get hit in MH3U).