There is no weapon stash in Runescape. If you need a sword or armor, you can either buy it at the Grand Exchange located at Varrok, or you can make your own.
Beside the chaos altar. You could also ask the tramp again he will tell you.
you need a partner to do that quest and i recommend using runehq.com its my first choice if you need quest help or even skill help.
to take the weapon stash the colonists had their
Godswords.
advice: get a weapon
A Weapon
There's weapon stores in almost every town around Runescape, look for a Sword, Bow, or battleaxe icon on your mini-map.
nothing
If you have a weapon in your inventory, click on it to wield it. This will un-wield any other weapon you have in your weapon slot.
Any weapon that has a great crush bonus:BattleaxesMacesMaulsWarhammers
all you need to do to get poison off of a weapon is use a cleaning cloth.
Dragon claws