Which bosses should I summon?

At the moment only the first one - Spectral Daedalus. We can easily defeat him, but always lose to Spectral Janus. We'll move onto Spectral Janus when we have more high level members.

Good reasons for summoning/hitting Spectral Janus at the moment are:

• Someone else has summoned him and I'm understandably bored of hitting spirit wells
• I need to do so for an acheivement
• Spectral Daedalus is on his 24 hour cooldown and I really want to hit a boss