Cleanse these Halls:Crawlers

Cleanse these Halls:Crawlers is a Quest in Villagers & Heroes.

 Elsa wants me to kill some Slag Crawlers 

Prerequisite
 * None

NPC
 * Elsa G5 in Pyrron Bastion

Objectives
 * Kill 9 Slag Crawler.

Rewards
 * 42 silver
 * 62k XP

Walkthrough
 * These Slag Crawlers roam all over the map.
 * Once you killed 18, return to Elsa to collect your reward.

Video Walkthrough (All credits go to Famar)