Tips on how to utilise resources on and functions of the Citadel to Develop and Maintain World settings
Tips on posting and writing in general
tips on posting Societies (part of the Codex Posting Advice)
The PCs find a strange helmet, when donned it will take control of that PC and speak and act trough him/her. It explains that it is benevolent and needs their help in a quest and that it will stop possessing the PC when the task is done. Great if a player is gone for a number of sessions.