Value of artifacts.

The dragon torso and the relic in the Dungeon of Doom. However, +8 to the sum is quite weak for a relic (when there are +24 and +20 available), it's perfect for a major artifact, in my opinion.

Then you'll have to make the dragon torso and helmet major artifacts, as well as the titan torso and helmet, and the titan shield and sword too (+9 total, what a mess).

Added after 13 minutes

Wlk777P.S. So, the blind charm was also listed as useless? That's definitely unnecessary, they got carried away...

The blind charm is a situational artifact - in most cases, it's not very useful (there might not be any blinding, or blinding might not be needed), but in rare cases, it can decide the fate of the party.

It's the same as with dispel (recently, Napalm used this artifact to pull off a practically hopeless victory against me), anti-dispel (with which Alex managed to bring the final of the St. Petersburg 2008 championship to a near draw), and many other anti- spells (the most notable are anti-berserk and anti-light). I even read a report about a game where the final game was won because of the presence of anti-curse.

Such artifacts shouldn't have a high level, simply because it's generally difficult to assess their usefulness (unlike, say, a +6 sword). That is, their benefit is variable, while the strength of the guard is constant.

Therefore, major artifacts and relics should have artifacts that provide a clear positive function for the hero (relevant or potentially becoming so), justifying the cost of obtaining them. And situational artifacts can reside on the lower floors - if it is really needed (1-10% of the cases), you can take it from any guard and run away in half the map. And in the rest, you won't even bother picking it up from the floor