[laiocfar]

If my memory doesnt fail, the squence to get the syreens on your side is A: to learn about the Deep Childs by speaking the Mycons in a conversation (there isnt any randomes, there many possibilities to pick up the fight before learn about the deep childs + i think that you need to speak them in some lava planet, i am not sure) or trading information whit Melnormes. B: Reach Betelguese or whatever and talk to syreens, they will tell you that they cant help you but you will tell them the true about their real home planet (called Gaia?), they ask for proof C: get the mycon´s egg shell, i recomend to pick up two of them, Melnormes can say you where find them. D: Back to Syreen´s startbase, Talana will agree an alliance with you but they got no ships so only will give you some captains and tell you about their fleet lost somewhere in greens Ur-Quan´s space. E: Get that fleet, ist easy to found but to make out from the battle zone is hardest thing in the game. F: uk err love Talana and by the way, she will ask you about an extra mission and if you end it you will get the sun device from Mycon´s homeworld, see syreens to take their revenge and get a hard won alliance.