(Usable artillery.)

(Apparently can only be used by members of the Elyos legion that captured the fortress.)

(The artillery seems to be working perfectly.)

You use the artillery. You finish the investigation.

(Usable artillery.)

(Apparently can only be used by members of the Elyos legion that captured the fortress.)

You finish the investigation.

(Usable artillery.)

(For some reason it isn't working properly.)

You finish the investigation.

(You use the Artillery successfully.)

(You can now use the artillery skills.)

You finish the investigation.