Sticking to the original two questions:
Could someone please explain to me how this is done?
For stealth and shield get into defend mode against some seekers in upper monastery and wait a few hours, then quit the battle heal up, and maybe repeat. I haven't done any training myself, but from earlier posts I think it takes a night to get up to the 80s 90s. On continous combat of course.
Do any of you have better suggestions on dualing the bishop, sammy and rogue? bearing in mind that my theme is to have critical strike and stealth for all party members?
Maybe start the bishop as a rogue, train up stealth and then switch to bishop. The rogues and samurais should fit the party theme quite well.
P.S: Sultan I got the same avatar just a day earlier