i just broke the val haazaks face solo yesterday and i was shocked, but i have tried hammer, insect glaive, dua blades even the hunting horn. what finally did it was the xeno metora bow, dragonking eyepatch a, dragonking eyepatch a, dober mail b, kaiser vembraces b, nergi coil b, kaiser greaves b, breaker charm (i only have level 1) vitality mantle and affinity booster, and a lot of nulberries, potions, mega potions, honey and herbs, demon drug, armorskin etc............ took me 28 minutes to kill it, and 15 to break its head. just keep shooting its head, use the power coating, poision coating and blast and bring extra vials to make more. this was the first time using bow too. im happy with the results. oh and my armor is not fully upgraded yet still have 2 or 3 upgrades left on all of it.