I'm guessing they can because Vindican, the Sith in the the "Return" trailer was wearing one.

Coruscant was attacked by the CIS. It's mentioned in one of the Republic Commando novels(or so I'm told) .

Some of the killing each other is part of the goal of being Sith'ari, the perfect being. If the apprentice is more powerful than the master, the master is killed. The apprentice becomes a master and takes an apprentice, apprentice gains more power, master is killed etc. Each time the apprentice gains more power than the last. Here is a simple version of this: Master1 teaches apprentice1 everything they know, apprentice1 learns and gains more power through their own experience and kills Master1 Apprentice1 becomes Master2 Master2 teaches apprentice2 everything they know, plus what Master1 taught them. Apprentice2 gains more power and kills Master2, becoming Master3 Master3 is more powerful than both Master1 and Master 2. Master4 is more powerful than Master1,2, and 3 Master9001 is more powerful than all the masters before him.

I never heard of the Halycon family. Never really looked up Jedi stuff.

Probably the same person over and over. They probably made changes to the bio so they posted it again.

Basically, this thread allows you to create your own character for roleplay and story writing purposes. It allows the reader to really get an idea of what your character is about, who they are, where they came from, etc. Added below is an outline for character creation. It's purposes will be to give the writer a general idea of what their character set-up should look like. Please remember, though, that this is your character, and you do not have to follow this outline if you do not want to. You may also add to it if you wish. Species/Race: Name: Middle Name: Last Name: Nickname: Gender: Date of Birth: Place of Birth: Age: Height: Weight: Hair Color/Style: Facial Appearance: Eye Color: Body Appearance: Home Planet: Current Residence: Allegiance: Profession: Armor/Clothes: Primary Weapon(s): Secondary Weapon(s): Miscellaneous Item(s): Biography: