He will give you a specific list of mobs for you to take pictures of.
He will offer to sell you a Soultrapper and a stack of Blank Soul Plates for 800gil.
To take a picture, equip the Soultrapper in your ranged slot, and the Blank Soul Plates in your ammo slot. You can then use the macro /item "Soultrapper" <t> to take a picture of a mob. You don't have to engage the mob to take a pic.
It is possible to get all 3 done in one game day.
Some monsters can only be found behind doors requiring certain beastcoins for entry:
Please be aware if you throw your Soultrapper away, Andrause will ask you to wait until the next shipment arrives. (At a guess JP midnight unconfirmed at time of posting.) You can purchase the Soultrapper & Blank Soul Plates from Zandjarl, The Colosseum (F-7).
NOTICE - Soultrapper cannot be used while under the effect of Sneak or Invisible.
Seeking to usurp the Tenshodo as the underworld's foremost supplier of contraband, Domina Shantotto requires that you remove its leader, Aldo, from the picture. A clandestine meeting between you and the target
has been arranged in the Gustav Tunnel. All that is needed to initiate contact is a black book, acquirable from Andrause in Norg.
SPOILER WARNING: Click here for additional details about this story line.