In that case shadow of the moon would be amazing if your issue is dying.
Still say magnitude for hammers, if your issue is defeating it fast enough. Hammers destroy akantor and ukanlos easily. If you don't feel like fighting copper blangonga (I wouldn't think badly if you didn't haha), juggernaut is #3 in the top 3 best hammers, chaotic order being #2/1 depending on affinity and magnitude being #1 but only with affinity.
Chaotic order is still a pain to make, but less so than magnitude IMO.
If all else fails, watch an akantor/ukanlos hammer guide video. only real differences between the two are weakness, health, and a couple attacks (ukanlos has 3 new attacks compared to akantor i believe... everything else is exactly the same.)
If you still can;t beat him... perhaps go back and beat every other quest in the game. At that point you shouldn't have any issues fighting him XD. he may be the endgame monster, but in no way is he the hardest.