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TL DR- electric bubble is on 15s timer, same as CD on leap/charge. Note that you should hang out at the north end of the side platform so you can move south (towards entrance / healer) if you do drop a bubble on your side platform. This is the easiest way that I, a Marauder (melee DPS), have done this boss fight. Any ranged DPS should be on the opposite side of you and the healer should be on the platform near the entrance. This will limit the amount of bubbles he drops in the middle area to only the one for the tank. Pro tip for Marauders/Sentinels: The electric bubble that the boss will drop periodically is on a 15 second timer, this is the exact same amount of time as the standard Force Leap / Charge ability (assuming you haven't spec'd to shorten that timer.) If you hang out on the side where the adds spawn (left 1st, then right 2nd), use your charge to DPS boss as soon as he drops a bubble, then back off to the side platform again when there are 4 seconds left on the Leap/Charge cool down.
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The sentinels were first made prior to 20 BBY, when Palpatine was still the Supreme Chancellor of the Galactic Republic. A sentinel droid aboard a command bridge.
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