NightWind
I'm 80% sure that 'Jackal' has something to do with this 'treasure coin', either he is the treasure coin or he has it or he knows where it is but couldn't get it. I also think that Otto will make Jackal into a member of the team somehow. Anyways, I could be completely wrong, and as always, thanks for the chapter!
NightWind:Hehehehehe
jackal is clearly a setup from the audience. I bet he's not even human. just planted some blood on his finger tip. didn't think Otto was so naive and trusting. especially when he has analyze. I'll chalk it up to the character's fatigue since the author clearly stated Otto would use all his spells when they were appropriate to use!