To add to what
@DM 경호 stated:
The GM's (Server Admins/Moderators) have the ability to type custom banner messages at will, and you will see the name of the Staff member responsible for the custom banner immediately PREceeding the message.
This is usually used only for formal server announcements by Admins, but Mercy (AKA "MewPlushie" AKA
@Harborer of Hope ) took the idea and started using it to rally help to those who were seen alone or asked for help. She calls it "Halping the nooblets" because its usually done for players starting out at Normal difficulty level.
In this case, she probably saw the room name asking for help and rebroadcasted it to the whole server to get more attention. Hope it got you the help you needed.