From the Patch Notes:
* If two or more of the towers have been destroyed: Neither the resurrection spell nor the scroll may be used. It is possible to restart at the defenders' restart location.
* If all three towers have been destroyed: Neither the resurrection spell nor the scroll may be used. When restarting at the defenders' location, the teleport waiting time that was 30 seconds will be 8 minutes.
It's pointless to post full siege guide while here everything working like some dev team wrote and this server havent nothing with Lineage 2 Interlude game.
It's kinda sad AleaTheRandomTrash that you know Lineage 2 only from demo shit servers like damage. Anw keep living in your world little down.