The Odin rewards do show up in book of souls or you get tribute, fc etc but sometimes it doesn't show the pop up dialogue. So we are forced to guess what we got.

Also the Odin with artifact talisman is very hard to fight. Artifact heals him when he takes damage. So if I fight him long enough, he starts gaining hp instead of losing it every round. The 15% magic increase every round eventually makes his magic so high that he heals more than the damage taken. I have fought him at 75% hp and he got back to 100% by the time my team died. So I 'undid' the damage my clan members dealt.