Who I should 6* next?

I have Vellajuel 6*, Belladeon 6* and Veromos 6*

My Giants b10 team is 100% on manual, and 80% on auto.

The other two in my Giants b10 are Bernard 5* and Shannon 5*.

Here is my point, I have some viable monster for b10. Vellajuel is good because he attacks the crystal first. What prevents Shannon to die. But these are my options. ...

Ahman 5* (Violent Blade( Hp, CR, HP), crit 100%, 18k HP) ...

Acasis 5* (Despair Focus (Hp, Hp, Acc)

Akhamamir 5* (Despair something (Thinking about blade), Spd (4 and 6 slots not decided yet. CD or Hp for 4. And Acc, Hp or Att for 6). ....

Ahman and Acasis safe runs....

Akhamamir speed on runs.(Definetely a good thing) ..