now i got him on all 3 devices.
My backup device was easy to get him. (wrote before).
On my mobile, i didn't even really think about getting him. Spent a 10 soul pack and got 50 fragments the first day, that was it. Then i decided to sacrifice my Viking, i got from the BNW event souls and got enough rare souls to get the blue buzz, plus a pharaoh and a gunner golden sun, nice exchange for a viking.
The last account lacking the blue buzz was my main acccount. I was at 160/200 and had no ironite or lambs to sacrifice, so i did some gambling and sacrifice my fully sharded lv 100 navigator and warrior child - was a tier 6 sacrifice and i didn't belive my eyes: 50(!) rare souls - jackpot! Adding the fact, that each soul also gave legendary fragments, it was a piece of cace for me to get him not once, but twice, plus a second prisoner and the missing corrupt ox cultist. Now that was an evening!