Guild Description on SWTOR

You're triggering Centering. This is gained at level 10 as a Jedi Sentinel (so it is Sentinel specific, though Sith Marauders have an equivalent ability).

You gain stacks of Centering whenever you spend focus or kill an enemy, and it doesn't do anything on its own until you reach 30 stacks of the buff. At that point, you can trigger Zen, Transcendence, or Inspiration:

• Zen - learned at level 10. Gives a bonus depending on your current lightsaber form.
• Transcendence - learned at level 22. Temporary Movement and Ranged Defense Bonuses for you and your party.
• Inspiration - learned at level 44. Gives a % damage bonus to you and your party.

it has both, but what sets this game apart from other MMOs is the storylines. So basically you could say the 'end game' is playing another char and enjoying its storyline. 8 classes, 8 storylines. So in that way, this game is much more focused in the journey than in the destination.

Because, let's face it, if what you enjoy is doing the same dungeon over and over and over for a chance to complete your 'pink armor set', WoW is a better choice for that :)