Item set effects? (possible spoilers)

[Chiller]

The Archmage's set has a hidden (in the sense that you get no text/tooltip with the description of the effect - the items actually change appearance a bit) bonus which gives 50 Energy.
The Crystal set seems to have no such bonus.

(These are the only 2 I can check atm - if I remember where I left the Mirror pants I can do that one later).

Are there any other sets with bonuses?

[eduran]

Crystal provides a health bonus.

[Chiller]

Crystal provides a health bonus.

Nothing extra on top of the +5 health / piece it already gives.

[eduran]

Are you sure you are wearing all six pieces and getting the glowing outline effect? For me, equipping the last piece increases health by 80, while the piece itself only offers +5 HP.

[Chiller]

You are correct. I needed the crystal shield too, which I hadn't realized was part of the set.

The Meteor set gives 100 Fire resist (6 pieces including shield - you don't need to have the shield on the current tab, which has been confusing me for a while).

[Klezzon]

If you remember where did you find the armor parts, please post it here:
http://www.grimrock.net/forum/viewtopic.php?f=20&t=7428