Wardens and Lightbringers
the wardens are the protectors of the pale tree, i suppose in theory, some non-sylvari could dedicate themselves to protect the pale tree, however they wouldnt understand what theyre protecting as they dont share the dream
the term ‘lightbringer’ comes from the order’s origins as demon hunters formed by turai ossa
“The Order of Whispers are a secret society working to protect Elona. They were established by Turai Ossa as his elite and secret organization. Since their establishment, they have been working behind the scenes of the governments, sending their members throughout Elona, working to keep the existence of beings such as demons and titans outside the knowledge of the populace. ’ – guild wars 1 wiki
i believe it means that they bring the light in times of darkness
EDIT
“We are all Lightbringers…if we choose to be. A Lightbringer is someone who serves as a beacon to others, illuminating the way of righteousness in these dark times. Demons walk these lands. It is the duty of the willing to drive them back to the cold crypts from whence they came.” – seeker of whispers in guild wars one
Kiel Replacement Movement
Thank you, Getefix. I think that answers my questions quite succinctly!