Cleared the Gathering Hall Quest 'Four Horns'! - MHP

Man, that was tough!

I upgraded my Powercharm into a Powertalon (had to defeat Lao-Shan Lung one more time).
For my weapon, I used the Light Bowgun, Spartacus Blaze, loaded with Pierce S Lv 1, 2, and 3. Pellet S might have actually been a better choice, though.
I also brought the maximum number of Sonic Bombs, including combination materials, since one of them refused to move out of the desert zone. Used these in place of traps. Just remember they don't work while it's enraged.
Brought 5 Flash Bombs too, but they're tricky to aim and didn't help much.
I forgot to bring Well-Done Steaks, which made things rough, but I somehow pulled through.

When you can't cheese them from high ground, aggressively use Sonic Bombs. Evading their charges is tricky, but generally you can dodge them if you focus on staying close. If your positioning is right, you can avoid them pretty easily. That's another reason why Pellet S might have been better.

片方は、一段上に上がれば、ディアブロスはなにもできますません。楽勝です。蚊もいませんでした。

あらー、お目々可愛いー。

もう片方は、砂漠から出ないので音爆弾で引きずり出してボコります。

2匹なのに体力フルで、他なんぁあって、超難所らしいけど、倒し方わかれば倒せます。