The citadel shield just protects the system from obliterators. It can still fall to an enemy invasion or fleets equipped with core crackers.

Throretically not. I can't see a way to test in SP.

Are there any enemy systems or empty systems nearby? They could spread their influence sphere over it and convert it peacefully.

You can still reach the star system. By "preventing free-movement on the node" the Citadel is just placing a native 'guard' (what a defending fleet would normally do), so any ships that enter the system can no longer move for that turn but can move afterward. 

I thought that the free-movement meant the movement which does not require navigation lane. As free movement usually meant that and Korean translation interpreted the Citadel tooltip that way. Then, is this just a localization issue?

PARAdoxiBLE wrote:

I thought that the free-movement meant the movement which does not require navigation lane. As free movement usually meant that and Korean translation interpreted the Citadel tooltip that way. Then, is this just a localization issue?

You're right. You can't move to a system with a citadel using off-lane travel. I tried to reach some enemy systems protected by citadels and was wondering why my ships insisted on using longer lane travels rather than moving off-lane (with a seeker admiral) until i read the tooltip so no, no way to attack that planet.

It can still fall to peaceful conversion and of course, an empire that's totally locked on small off-lane planets is probably not much of a threat anymore but you won't be able to eradicate it militarily.

Hi,

Actually you should be able to free move to that system, it's an exception case that should be handled. We know it's poorly explained, but the tooltip is already long enough. To recap, placing a Citadel on a node will:

- Add a shield that cannot be destroyed

- Add an automatic guard on the node

- Fire BEB rounds for each phase of space battles happening around this node

- Prevent enemy fleets to arrive at this node using free move EXCEPT if the node is not connected to any starlane

- Also unlock some Citadel specific star system improvements to be built

jhell wrote:

- Prevent enemy fleets to arrive at this node using free move EXCEPT if the node is not connected to any starlane

Could the exception be mention in the behemoth specialization screen? That screen doesn't come up all that often, so I imagine that adding a few words there wouldn't hurt much.