Polygamonster (Neo)

Achievement unlocked! "Polygamonster"!

You got married to more than one monster! But in the grand scheme of things, it only damns you so much more.

Dreams of a harem may become a nightmare.

+1 to two skills of your choice (expires in 24 hours)

+a small sack of essences of your monster wives

Reference
Unlocked in Chapter 48 "Elven Girls Are Easy"