Does concelment stack?

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Let's say I have a Warlock that casts eye bite on a foe successfully, he then moves three squares away from the foe. His Shadow Walk has given him concealment (-2 Attack), while his eye bite has given him invisibility and thus total concealment (-5 Attack).

Does the total concealment trump the regular concealment and give only -5 to attack, or does it stack together to give a -7 to attack?
No - Total concealment is an upgrade of concealment.
As I understand it, the Warlock will have total concealment vs the target of the eyebite, and concealment vs any other foe in that encounter.