Usually, pirates are more of a nuisance and while you can pay them off so that they won't attack you, it is probably best to take them out more often than not.

Vaulters however have a very advantageous interraction, which can be one of the reasons why anyone else would want the pirates to be gone, is that you can teleport your fleets to any pirate lair you see IF you are at peace with the pirates, so you decide if you want that or not.

As far as them attacking your fleets, I have no idea, haven't played enough vaulters, however, if someone else is at peace with them you won't be able to attack them with your corsair fleets.

Pirate Diplomacy is better for factions like Unfallen and Umbral Choir, the first start very slow and have the Trusted Broker law from the very beginning so they can avoid military until they stabilize while at the same time ignore pirates who usually mess with vineships. And the second get totally screwed by pirate detection which is almost always way ahead of your cloacking.

GTI wrote:

This sounds interesting: Do I build a portal in a system of mine and one in a pirate lair (there are lots of them), to teleport to it?

I case you are allied with pirates faction (playing Vaulters) you can use all pirate lairs to teleport. No need to build portals these places.

GTI wrote:

Am I attacked by pirates if I start to explore the galaxy as a corsary without having friendship with them?

Nope, they believe you're one of them. If you are allied, your common fleets are able to retrofit in pirates systems (lairs). Your corsair fleets have to switch to regular fleets again, before being able to retrofit.

How can I teleport to the pirate lair? should I build a portal in a system I possess and after that a option to teleport to pirate lairs is going to be enabled?

GTI wrote:

How can I teleport to the pirate lair? should I build a portal in a system I possess and after that a option to teleport to pirate lairs is going to be enabled?

Sure, to teleport from one of your systems you need a portal.

Thank you for the replies guys!

Groo wrote:

Nope, they believe you're one of them. If you are allied, your common fleets are able to retrofit in pirates systems (lairs).

Good evening. Groo, I wasn't able to retrofit in pirate systems. The UI tells me I'm only able to retrofit in systems colonized by me. I was trying to upgrade an explorer ship (Faering) for which I had already a new Faering design.  

I'm not able to play ES2 at the moment, so I can't check out. Make sure to switch your corsair to regular fleet/ship first, before you try to retrofit. And recheck you have a non-aggression pact with pirates. Often AI players neglect your good relationship by influencing pirates faction within same turn you supported them. Anyway, I could be wrong about, but I don't think so. I. e. minor factions allow you to retrofit, when you have at least 50% good relationship (or was it even 25%)? Feedback appreciated. Same with feedback from other users, being able to check out.