Argento is currently the only known silver spirit tree to ever live in RuneScape. Exactly what this signified is unknown, but it may have been a symbol of great power.
Argento was said to be a kind, wise tree, who was always willing to speak with the gnomes that lived in the Gnome Stronghold. He was a particularly good friend of Hazelmere, a former advisor of King Healthorg. They spent many hours talking to each other during the king's reign.
One day, Hazelmere felt a great sadness, as if the Anima Mundi itself was crying out in pain. Hazelmere then suspected that Argento had died, but upon going to see him, found Argento seemingly alive and well, but refusing to talk to Hazelmere. Hazelmere, wondering what had happened to his old friend, went to a fellow advisor, Oaknock, for advice. Oaknock theorised that an illusion had been cast on Argento, and immediately suspected the King's third advisor, Glouphrie, the only person known to be powerful enough to cast such a spell.
Oaknock then constructed an anti-illusion machine, and brought King Healthorg and Glouphrie to Argento's body. Upon turning the machine on, Argento's death was revealed, with Oaknock saying that it must have been Glouphrie. King Healthorg became furious with Glouphrie, asking when it is ever right for someone to lie to their king. Glouphrie's reply that it's sometimes okay infuriates Healthorg even further and he dismisses Glouphrie on the spot, banishing him from the stronghold.