1 - You should have 30 millions defense power at least.

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2 - You are ready to defend and hold league beacons at any time and with 100 % of your def if neede

3 - You should protect and support your league mate against any attacks even if there is no PVP. 

 

4 - Being a shield member will give you the exception to hold your own beacon with 30 m permanent def at the beacons, and will enjoy all other benefits for shield team.