VERY easy xp
In the tomb on Korriban there is a dead Jedi where if you take things from him 2 hissis will spawn. Kill them then receive your xp. Then "open" up the jedi again and 2 more hissis will appear. You can spawn a lot of hissis' at once and the easiest way to kill them (I've found out) is the use the force power death field on a large group of them.
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