The title the Guardian of the grove is unlocked for completing the Solak boss collection log. This requires players to get every unique drop from Solak. Unlocking this title completes the So-lacking in drops feat.
This title changes according to the language of the server on which RuneScape is played, as shown below:
|| [Name] Wächter des Hains / Wächterin des Hains
|| [Name] le Gardien du bois
|| [Name] o Guardião do Bosque / a Guardiã do Bosque