Shields
 

I just found Tower Shield.
but when i bought it. says only few people can use it.
does that mean not all my army will get benefit from it ??

i have
2 ArchMage
25 Droids with 25 Repair Driods
1 Black Gragon
20 Polar bear.

so who all will get the benefit from Tower Shield ? shall i buy it ?

The Tower shield will give +2 Defense to all units of level 1 to 2, and +5 Defense to all units of level 3-5. The higher level units get a bigger bonus to Defense than the lower level units, but all units will benefit from it, not only humans.

Ivra. yeah i undertand that. read what it is doing.
my question is. "it says only few people can use it." what that means ?

I wouldn't waste my money on it, especially if it's early in the game :)

Sorry, answered wrong question :-)
I do not know what that means. Probably just flavour text. You can try it by saving first, buy and equip it. Then look at the defense of your troops. It should have been increased by 2 or 5 depending on the level.