Currently, when used against certain factions the barrier is very hard to counter effectively and it vastly increases the effective hp of units which can use it well (fast, armored etc)

To stop the toxic behavior I suggest that barrier may recharge up to only x times it's starting barrier health.

or maybe it uses winds of magic to regen. So the more you regen it the more it eats into your reserves.

You might have to balance that by giving units slightly more to start with or something as that would be a huge nerf 

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Theo91#7431 wrote:

or maybe it uses winds of magic to regen. So the more you regen it the more it eats into your reserves.

You might have to balance that by giving units slightly more to start with or something as that would be a huge nerf 

Or also possibly a fact that barrier cannot recharge if WoM reserve is lower than xyz.

Maybe recharge speed also being affected by remaining WoM in reserve.