Black Cleft question - overcoming Magic resistance penalty?

The way sundering charms work seems pretty straightforward - breaking monster immunities (95% resistance instead) but lowering your own resistance to the same element.

What confuses me is the "magic resistance" penalty of

Black Cleft (Hammerdin/Bonemancer charm) - as far as I know, there is no way (as a player) to increase your "magic" resistance - only the four "elements" can be found on gear.

How does one overcome the "magic" resistance penalty of

Black Cleft? Or does it just mean you need to extra careful around monsters that do "magic" damage?

Technically, there are items that have MDR or Magic damage reduced.
But I guess most people are just careful around high magic damage monsters.

e.g. :

Mal rune,

Vampire Gaze

Spirit

Monarch has Magic absorb and the

Safety Shield also has magic resist but is never used there is a Famine of magic resist items, would be nice to see some added in the future

Here are (unfortunately, pre-D2R) lists of items with Magic Resist, Magic Absorb and Magic Damage Reduced. The last stat, despite its name, protects from magic and elemental (fire, lightning, cold) damage.

Goes both ways for

Black Cleft. You can't realistically (read: without dropping

Key pieces of gear for some silly

Safety Shield) counter the % res reduction on yourself.

And you can't add to the % reduction on your target.

So not only does it come with what is effectively the biggest penalty out of all sunders but it also comes with the smalles (by a landslide) gain, to the point of basically being just a complete waste of a grand charm slot.

Interesting - thank you all for the info!