the Master is a title unlocked by obtaining 250 training points with players who have done 10 or fewer kills of a boss.

Translations

This title changes according to the language of the server on which RuneScape is played, as shown below:

Language	Title
German	[Name] der Meister / die Meisterin
French	[Name] l'expert / l'experte
Portuguese	[Name] o Mestre / a Mestra