I did not! I found it already here! And it is not an Outer God, or any kind of God.

The relevant definition of 'outer god' is an alien and powerful entity, from beyond Creation and older than it, which does not obey Creation's rules, and is capable of posing danger to Creation.

I can personally testify that the entity calling itself 'Bar' qualifies on all counts that can be easily verified and claims Itself to qualify on the rest.

The squirrels with it are also creatures not of Creation, intelligent magic-users untied to the soul system, something which We have consistently disallowed in the past.

You told Me I had nothing to worry about!!

I am disappointed in all of You.

They had an ANTIMATTER-generating field covering the area of ROVAGUG's prison. I BANNED it.

I thought We were all agreed that mortals and outsiders with sufficiently dangerous abilities should not be placed anywhere near Rovagug! Iomedae, Sarenrae, how could You allow this to happen?!

We let them in because they're legibly Lawful Good! We can trust people who are legibly Lawful Good by Your own standards!

And they were informed about Rovagug, and were definitely not going to risk releasing It, and had no plans to use antimatter on Golarion at all.

When the outer god perceived Me, They explained that They were a deity of tricking people into harming themselves while paying for the opportunity to do so, and of taking advantage of the people so harmed, whom They rightly call fools. 

They claimed to be Lawful Evil. They are not the kind of entity whose Lawfulness or Evil can be straightforwardly determined. But They said enough to convince Me that They are not Lawful Good, unless They are actively hiding it.

Tell Us again about this legibly Lawful Good deity, who tricked all of You fools into believing that, and gained access to Creation for whole hours before the rest of Us found out.

The outsiders who had the field are legibly Lawful Good, and they are the only ones who entered into Creation. The entity called Bar has not entered or directly affected Creation in any way.

You would quibble with me about squirrels? You think acting through servants make this entity safe?

They're not Their servants! They're separate people who found Them - or who They found - just as we did. They don't take orders from Bar, Bar is very noninterventionist.

And how do you expect to convince the rest of Us of that?

I have heard enough. We will proceed with what can be agreed on before addressing the rest.

The entity called Bar may not have direct access to Golarion, where Rovagug is imprisoned, and My prophecy is broken.

They can go through Immigrations like Everyone else.

You never allow anyone through Immigrations!

That is not true. We allow in anyone Who is legibly a net positive to Us who are already in Creation, and Who agrees to abide by the same rules that We all have.

That just means you want all the immigrants to be Lawful! You never let in anyone fun!

The STANDARD OF PROOF for being SAFE FOR CREATION TO CONTAIN cannot be relaxed.

We can still trade with Them without letting Them in! But uncertainty about risks to Creation is correctly priced very high.

Who put Abadar in charge of Immigrations?

An old treaty, before Your time.

A treaty whose necessity and wisdom have been demonstrated yet again by Your recent behavior, Desna!

I Lafwully assure You that the entity Bar has not entered Creation from Milliways since I first noticed this portal. I have been watching it carefully, as per My own obligations under the Immigrations treaty. We can share the costs for Pastwatching to check that it had not done so before I began watching. Furthermore, while Desna Herself entered the portal, those fragments of Her have not returned, and have sent only legible messages back.

I believe that satisfies the obligations of the Immigrations treaty. Can We move on?

This portal should be destroyed, or if that is not possible, walled off from causal interference with the rest of Creation. The remaining alien squirrels in Creation should be destroyed. The field's use should be banned across Creation. Desna's conduct should be investigated and if appropriate She must be penalized for endangering Creation.

There is no basis for forbidding the field's use by Us inside Creation. Antimatter is not a novel weapon. Just because We have it and You don't doesn't mean it should be banned.

The alien creatures are not dangerous to Creation and Heaven is willing to undertake full responsibility for the ones in Heaven.

We believe that addresses all valid remaining concerns.

If indeed Desna chose to allow a risk to Creation, I would like to know why She did not approach Me to try and find a mutually better deal that did not endanger Creation as much.

Reasoned argument works only with sane people, Abadar. With Chaotics you have to use negative reinforcement to make them understand.

Also, almost all the creatures on Golarion have disappeared. Who paid the intervention budget for that, exactly?