Visit the Gnome Stronghold and talk to King Narnode. It seems that Brimstail has managed to get into Arposandra, and saw a being of RS gold incredible power. King Narnode would like you to lead a small team of soldiers into Arposandra and discover what's happening, and make sure that the gnomes are protected from Glouphrie. In addition, he would like to know why Glouphrie had killed Argento and the Silver Spirit Tree, before being discovered by Oaknock.
This is the final battle of this section. It is essential to carry powerful melee weapons because Wyvoch will be fighting you once more. Prayer can only be partially effective. Speak to the gnome soldiers, who wait for your arrival at the sewer dungeon. They will knock on the door. Enter Arposandra and run by the Glouphrie wizards, then go to the Temple at the center of Arposandra. You will automatically watch through a window, and see an eerie cutscene that involves Glouphrie and Lucien, the Red Axe Co., and OSRS buy gold Lucien.