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This should be in the ToB section because the Ritual take's place in WK.

Though I will help you, every ritual skull has his party back-up (those goons that protect it), all of those guys should be destroyed before you attack the ritual skull (there are 4 or 5 teams IIRC).

First destroy all the members of a single team, then go after the Ritual Skull of that particular group.

Without the destruction of the protecters of the skull, the skull cannot be killed, he will hit the ''near death'' state, but cannot be destroyed if one of his team member is alive (they will walk away and hide, so use true sight to detect them ect.)

This should do the trick... otherwise it's a bug.