The advantage of the War Elephant is that is does not require any resources to construct, otherwise the advantage of this special unit is lost (Knights require horses and iron to build, which have to be located or traded for which makes acquiring knights somewhat trickier). Indians can just circumvent this problem. Ivory would cause just the same problem (still have to source the ivory from somewhere) which would make it a pretty pointless special unit.
Again, this comes down to an issue of game balance, not pinpoint accuracy.
Again, this comes down to an issue of game balance, not pinpoint accuracy.
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