Siren in defense only good if you have the War blessings. Siren however in offense are insane and very powerful. For a lower player they must focus to level her the must higher possible fast. Siren will help you deal with all Monster islands and unlock them all. So if a player by example are level 20-30 or 60 and have already Siren at level 12 or 13. You will destroy all
Siren are good against the majority of defense towers, deal massive damage to Minotaur and Castle Gate
If you play Ariadne you can use Siren Power this will allow you to beat strong base
Siren is in my top 3 units with Medusa and Trebuchet until ascension level 90. After its Griffin and Pheonix
If many don’t have focus on her. You must start right now. So in a Odyssey if you get Siren Attack or Siren Health take it. worth it
For level 100+ she can be deadly if you have max her with over 5% enhance in both Attack and Health.
Remember to use defense mode when you are close of Lapedos tower or you will lose all your siren. Its only the key to keep huge army of siren
If you are between level 10 and 90 I recommend very highly to start to use her. when you use this unit by example with Perseus with 3 units and 4 power you destroy a base in a short time. Reach the gate with 1 minutes 45 seconds or more