-XX to Monster Defense Per Hit

This adjustment is different than Eth in that every strike that successfully lands on a monster will reduce its defense by that amount. For example, say a weapon with -100 Monster Defense per Hit strikes a monster with 1,000 defense rating three times: the first hit reduces the monster's defense rating to 900, the second reduces its defense rating to 800, the last hit reduces its defense rating to 700. When this attribute is combined with a fast-hitting weapon to chip away at a monster's defense, it can benefit the entire party because unlike the Eth rune's defense rating adjustment, this method of reducing a monster's defense applies to everyone.

Where can I get -XX to Monster Defense Per Hit?

Equipment:

Malice (rune word weapon): -100 Monster Defense per Hit

Soul Drainer vambraces: -50 Monster Defense per Hit

While this is a useful effect to have, it's also quite rare, being available on only two pieces of equipment.