Boss properties of WiK bosses?

For the WiK bosses, what properties do they carry? Natural resistance? Half skill cast time and double damage? Both?

http://wiki.guildwars.com/wiki/Bosses

I'm sure all bosses basically have the same thing going on. There is no difference with WiK bosses and regular bosses.

Bosses have different properties depending on what campaign they're from. Since WiK is Prophecies, the bosses have the same properties as other Prophecies bosses, Natural Resistance.

But WiK bosses require EotN to appear, and they have skills from all campaigns. I thought that would make them an exception, especially the bosses in the WiK exclusive areas (Divinity, Seaboard, Riverside, etc).

Actually, even the Eidolon boss (Qwytzylkak) that appeared in the Elonian Halloween quest "The Killing Joke" had Natural Resistance. I believe this may be because this is by "species" (more appropriately, skin) of boss and not campaign (the original being the Eidolon boss in Iron Mines of Moladune). In this case, White Mantle and Mursaat bosses have Natural Resistance since the originals in the Prohecies campaign had it as well.