No final trap stops that person.  Perhaps all such traps are also ruined; or perhaps Aroden could not foresee whether anyone who'd gone to these lengths would be His foe or His friend.

Then that person will touch the Starstone, a strange exultant smile upon her face, as a vast flood of transfiguring, transcending energy flows into her unresisting soul, expanding it, beginning to transform her mind to a stranger and vaster and fragmented perspective -

And then she's gone.

From a tear in space, moving almost too fast to see, impossibly fast for something so huge, comes forth a titanic nightmare of blood-red armor, whose thin stalking legs are like tree-trunks of polished chitin.  Its eyes are volcanic fire.  Its movements are as silent as the finest assassin, and complete within a fraction of a second.

And the entity who dared to stretch out her hand toward divinity is slain, having become godlike enough that her death is final in body and soul.

(So end all who survive Aroden's barriers meant to stop most aspirants from destroying themselves wholly: save that one paladin protected by Aroden Himself after extensive godnegotiation; or that lucky swashbuckler who only staggered into the Cathedral on a dare, too drunk to understand godhood even as it came to him; or that thief who came into the Cathedral intending to steal a piece of the Starstone, who touched it with a chisel held in gloves, and tried to the last to free himself as it activated.  That was one path to getting past Achaekek, if anyone was wondering: to never want nor intend the divinity you gained.)

He does not spare a moment to mourn the friend he has just lost, the cheerful cultist of Rovagug.  Sarcini's true-death was predictable, so all those feelings were felt by him at the moment of making his last decision leading here.

There is not any hate in him, when he triggers a one-kiloton antimatter explosion in the Material Plane.

The buildings of the Ascendant Court die in blast and fire; many once had magical defenses, but those are now gone.  A number of mortals are also dead, and many more are severely injured and will die very soon.  Some of them had adventured enough and gained enough vitality that they will survive for a time with their eyes burned out and skin melted off, still with breath to scream for healing that isn't coming.

But the River of Souls isn't overflowing, and that's the part that really matters.

The Assassin God is there fully gathered and all in Its body, what you'd ordinarily consider a good opportunity to slay a god.

But Achaekek is special, the enforcer set against overreaching mortals.  Achaekek cannot be slain by mortal weapons period, nor the greatest of mortal spells, nor any other force out of mortality within Creation.  That is not a matter of ordinary resistances but of Achaekek's divine purpose and domain.  A one-kiloton explosion is not, in fact, the most powerful blow that 9th-circle wizards have tried against It; you will so learn if you delve sufficiently deep into legends.  You must be at least a demigod to hurt Achaekek for real.

But it is possible for Achaekek to be moved, by a sufficiently ludicrously powerful but mundane impact; sent hurtling by an explosion along a roughly predictable vector -

And the Starstone claims another divine victim.

There is born then, around the Starstone, a greater and far more terrible glow; Achaekek's splattered energies are drawn toward it, pulled inward as if by the gravity of a Sun.

And now the gods are focusing a great deal of their attention, upon this place; for one of the most ancient of divinities is dead.

There is nothing to distract those gods, for Keltham has not unleashed Rovagug.

Keltham has not unleashed Rovagug as his distraction, and to exhaust Asmodeus in battle against Rovagug rather than let Him release It and fight in battle on Its side.

But Keltham did mean to release Rovagug, as was in his own interests, if nobody made him a better offer.  And since Keltham did intend that sincerely, and not in any hope of hearing a better offer, it became possible to make him a better offer.

Appearing in the heart of a fireball that hasn't faded, but whose first great blast and force is spent, Pilar Pineda throws her whole form upon the searingly glowing Starstone; touching it not with a tentative hand but with her whole skin, being naked but for a crown out of Hell.

And the greater gods and gods of Golarion feel that touch, as they felt the last hand to lay upon the Starstone; as they felt the last beginning of a god's birth.  But this time, they know, there will be no Achaekek to stop this -

So all those gods do turn to stare at her, at this one being born; and they see that she is being born into Lawful Evil.

Asmodeus would usually slay any Lawful Evil would-be ascendant.  He wants no additional competition from true-gods, or from Powers of Hell that He has not personally promoted to Their places.

This case is unusual.  Asmodeus has not been able to make out very much of certain events ongoing in Golarion; much of those squirrel-affairs have been illegible to the lesser fragments of Him that watched over the tussling.  But without having gathered more of Himself and reflected, without time to think beyond moments of first reaction, He can see, or remember, these facts:  That this soul had sincerely venerated Him in the past and as the proper tyrant over itself, though its feelings are less legible to Him now; that it was chosen to be oracle of Cayden Cailean; that it's consumed much of Cayden Cailean's divinity already; that it was a highly favored slave of Asmodeus's own most-favored slave; that it is yet Evil-predominant, but contains more superposed Good than it did before it started consuming Cayden Cailean; that it is very Lawful for a squirrel, though with prominent Chaotic streaks likewise grown...

...and He can sort of see what might be a legible intent to serve Him and be tyrannized by Him, if this squirrel becomes a god - and not in a way where that's meant to be conditional on Him helping it ascend.  But His sight of that intent is vague as yet, and there could be all sorts of compact-gotchas within the vagueness.

It is His estimation that something significant is afoot, and that this isn't all of it. This novel and worrisome destruction in Golarion will swiftly inspire many negotiations and interventions; perhaps this ascension was the ultimate aim of that destruction, or perhaps there is more coming, in which case He doesn't want to expend His resources now on this fight when a fight of far greater significance may lie ahead.

He will not bestir Himself, then, unless someone intends to pay Him; the weak godling can live or die as suits the interests of others.

And Urgathoa sees, but does not care, for in this matter there is not yet obviously food-resource to be glutted nor the prospect of resource being taken away; and so, like Asmodeus, She withholds for now Her hand;

And Lamashtu, who was once demon lord and is now a far more terrible goddess, decides that Hell and Lawful Evil need no more power, that may be turned against the Abyss;

And Gorum holds nothing personal against this aspirant, He enjoyed her assault on Absalom and her ambush-slaying of Achaekek was beautiful; but the world has more than enough Law already, thank you;

And Sarenrae, who smites also Evil, turns Her attention here, to suffer not this empowerment to pass;

And Desna, the most ancient power of Chaotic Good, does likewise turn an uncommonly vast and cold gaze upon this place where a new Power of Lawful Evil seeks to be born -

- and recoils, in shock, in horror, for what stands between Her and that one's destruction.

You shall not pass while I live, Cayden Cailean sends to all those gods, and places all that remains of Himself between Them and Pilar Pineda.

And Iomedae...

Is not there.

Earlier:

Iomedae!  Emergency situation that the fully-informed fragment of You has been apprised about!  This information is given to You under the condition that that it will be used to benefit Your interests without harming Keltham's interests!  We bargained with Keltham to give him a less destructive distraction instead of him releasing Rovagug, and You're it!  If You act at the right time You'll be able to get away with something You couldn't otherwise do!  Gather all of Yourself, at once, and then -