If the info here is not understandable without context despite Keltham's best efforts, as would not be terribly surprising, they can hopefully ask Ione Sala, the Oracle of Nethys, currently findable in the Temple of the All-Seeing Eye.  Ione is forbidden to help Keltham about anything that matters, but she may be able to help Iomedans.

If Ione Sala isn't allowed to help with this, unfortunately Keltham did not think of this fast enough to ask her, spend whatever resources are required to rescue Asmodia of Project Lawful from Cheliax.  Carissa Sevar also has this knowledge, but will not willingly help destroy Cheliax, so only go for her instead if Asmodia is unreachable and you think you have sufficiently good mind control.

If Keltham is taken out and the info here is not understandable without context despite Keltham's best efforts, as would not be terribly surprising, they can hopefully ask Ione Sala, the Oracle of Nethys, currently findable in the Temple of the All-Seeing Eye.  Ione is forbidden to help Keltham about anything that matters, but she may be able to help Iomedans.

If Ione Sala isn't allowed to help with this - unfortunately Keltham did not think of this fast enough to ask her - spend whatever resources are required to rescue Asmodia of Project Lawful from Cheliax.  Carissa Sevar also has this knowledge, but will not willingly help destroy Cheliax, so only go for her instead if Asmodia is unreachable and you think you have sufficiently good mind control.