From Dragon Quest Wiki
Quest #166 - "Research and Destroy"
Location Well on a hill, West of Batsureg
Availability After downloading on DQVC
Requested by Man in well
Fulfilled to Man in well
Reward red orb; sorcerer's stone for repeat
Detail Defeat Elusid very quickly.
Hint for solution Elusid is a grotto boss. Beating him in 8 turns is sufficient.
Repeatable yes
Date Released March 4, 2011