"Know your enemy" achievement.

[Follow The Faceless]

Any advice on how to get it? Pretty annoying to run blind through every age for some missed Oni like Scorpioclaw (wich already found)... can they be found in Ruins? Cause there are no any guide in the internet, nor any list of enemies.

[Dar Klajid]

In the Ruins you can find Sableblade and Nightblade.
And in MP in the later Phases there are some new types of already met Onis.

[Rogue]

Sabreblade and nightblade in ruins, the rest just do phases including the ones in online mode as they have the rest. All the way up to phase 12.

The open world sidequests from Kiyamaro the blacksmith will force you to find the missing onis if you want to upgrade your weapon/armor. They are usually located in thick miasma area like the underworld.

[Follow The Faceless]

Thanks, that makes things easier :3