Black Guard Swordsmith

The Black Guard Swordsmith will spawn if someone clicks on the pattern on the ground. This will easily happen if a party member doesn't realize what will happen so this boss usually comes as an unexpected add while the party is pulling regular mob packs.
Overview
Tank
This mob is more of an unexpected add than a boss. Be prepared to grab threat on it if someone summons him.
Damage Dealers
To help the party out don't click on the pattern in the middle of a fight with mob packs. If you want to kill him then announce it to the party.
Healers
This mob is more of an unexpected add than a boss. Be prepared to call it out and heal through it.