If you find it hard to beat some bosses, there is a simple strategy that makes it much easier.As soon as the battle starts, lighting dash towards the enemy. This will give you a chance to hack away at them, when they start to attack, just block, wait for the split second they take a break and force repluse. Get to their body as fast as possible stab them on the ground and repeat.

On the imperial kashyyyk level, after the first cutscene starkiller will be standing by a tree (to his left), go behind it an there will be a Jedi holocron with the Kento costume.

I know that some enemies in this game are huge and intimidating but don't let that discourage you all you have to do is use force lightning it's really wonderfull it works on all huge enemies including the rancor the at-st and the imperial purge trooper and all the ones I'm forgetting about but any way if you can use force lightning on them I can guarntee that it will severly weaken that's only if you use all your force but it's worth it most of the time you can just jump next to them hit them with your lightsaber a couple times and you can do the special kills remember most huge enemies can't block force lightning it will paralyse them fore a couple seconds after and thats all most of you will need to kill them