This guide will explain where Vermin are, the skills, attributes, and weapons required to be maximally efficient in killing them, and of course, the process in which you kill the Vermin.
Skills;
1. Cyclone Axe
2. Triple Chop
3. Bonettis Defense
4. Balanced Stance
5. Dolyak Signet
6. Vigorous Spirit
7. Live Vicariously
8. Mending
Attributes;
Healing Prayers - 8
Strength - 9 (8+1)
Axe Mastery - 16 (12+1+3)
Tactics - 8 (7+1)
Armor and Weapons;
Unlike most Warrior solo builds, this one doesn't revolve around the damage of Gladiators Defense, so having a decent weapon is a must. Any Collector Axe that is 15^50 or 15% while enchanted will do. Try to mod it with a Vampiric for extra healing and with a Fortitude or Enchanting, depending on if you like having more health or Vigorous Spirit lasting longer. For a Shield, I use a 30/-2 stance, but really 45/-2 enchanted would be better for this, because you are always under the effects of an Enchantment. Shield doesn't matter much though, the Vermin are pretty weak

Now for the fun part;
Before you get to start, make sure of these three things:
1. Your Attributes are set correctly.
2. Your Skills are set correctly
3. Your inventory is completely empty besides the Axe and Shield you are using (Which won't show up in the f9 window anyways) and an Identification Kit (And salvage kit if you like salvaging)
Having a completely empty inventory allows you to zone and kill the big group of Vermin again and come back with a full inventory, which will merch out to ~3k
On to the fighting.
Leave Senji's Corner, cast Mending, then run over towards the first group of Vermin (up that little ramp, left, then up some stairs, then to the right). Agro these three or four Vermin and continue the way you're going, up another ramp, then down some stairs, down another ramp then up a ramp and you should see three more groups of Vermin. Agro the Vermin that are right next to you, then agro the Vermin on the bridge. By the time you get a little less than half way across the bridge, the first group of Vermin will be running away, so quickly agro the bridge group, and go back to agro the fourth group.
(Tip: First of all, Balanced Stance is for agroing, not fighting. Anyways, only use Balanced Stance after you've been hit with jagged strike, or begin bleeding. If you're not bleeding, you wont get knocked down.) Once all four groups are attacking you (or three, if you lose the first three you agroed, its no big deal) use Dolyak Signet, then Live Vicariously, Vigorous Spirit, Cyclone, then Bonettis, and you should look something like this...
Once they are dead, loot then go back across that bridge. You'll see probably two groups of Vermin at the other side of the bridge and past it a little bit. There are two ways to make it past those groups of Vermin. One is to agro them, pull them backwards out of the choke point, then run past them, or wait for them to move North on their own and ninja through. Either way, once you agro them, move through that little choke point, then go to the left, then north as much as you need to agro all the vermin you see in the black area. Make sure you have Shreader targeted so that he will die around the same time as the rest of the Vermin. If you look like this, you're doin good.
Now, wasn't that fun? Loot and continue North to find three more groups of Vermin. Agro them all and kill them.
Now you think you're done, but look at how much room you have in your inventory (probably a little more than half is full) Zone into Wajjun Bazaar and zone back into Xaquang Skyway. Now do the run in reverse. Kill the group of three groups, then the big group with Shreader. Once you kill the big group again, if you have 3-5 slots left, go kill those three groups on the other side of the bridge, and if you have 9-10 slots, zone back to Wajjun then back in and repeat!
Now what to do with all these Vermin Hides...definately don't merch them. Instead, trade them in at the collector Yu Lae for a 25g per 5 hides profit.
Have fun, get rich, and then thank Tom
