I would like an equipped shield. There would be different points on the bar where if your shield dropped below that point, it would only recharge to that point. Then, one you make it back to the city, you can repair it to full.
Also I hope there will be a defense skill tree that will allow you to increase your recharge speed, or raise the amount of damage it takes for your shield to drop one point on the bar.
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I think that would be a good idea, would be an advantage for titans because they would have more armour but would also slow them down a bit more and stop them from just charging ahead all the time