Arianwyn

Arianwyn first appears in Central Ardougne at the end of the Regicide quest. He explains that King Lathas and Lord Iorwerth are trying to bring back some Dark Lord(Later revealed to be Zamorak). He encourages players to read the letter that Lord Iowerth sent to King Lathas.

After players complete the fifth installment of the Plague City series, they will have access to Lletya where Arianwyn can start them off on the Mourning's Ends Part I quest and its sequel.

He is a key character in both quests.