so, if you aren't using a M&S derivative for you helm, you are going to want HLD on your weapon. Keep in mind, if you have 30 on your helm, adding 50 to your weapon doesn't give you 80% chance to land HLD on a hit...there is an equation that determines the percentage (100 - first tiems hld * 100 - 2nd items hld) / 100.
Elemental damage...you want to choose the elemental weapon that corresponds with whatever the lowest resist is of what you are killing.. you can find that on several different hunting guides on the web. so in the case of your 100% fire weapon, all of the weapon based damage is going to be applied to the fire resist of Navrey, maximizing your damage output.
If you have the Swords Mastery and utilize onslaught (which lower the resist of victim based on swords, tactics, and damage type of the weapon)which means if your weapon is attacking the victims lowest resist, its lowered even further and the amount of damage you do is devastating.
For Navery I prefer a fire double axe,and use onslaught and chain double strikes. depending on the roll, I nnormally drop rocks, whack whack whack, and decided if its worth dropping rocks again once they reset of just finishing her off with my axe. don't forget your stone boots, and be quick to put them on and off once you are webbed.