You should see the shield as temporary extra health. A part of the damage (i'd say not more as 70%) you take, goes from the shield's health. The other part goes from your own health.

The 'health' of the shield is limited and the shield will dissappear if the linit is reached or after the 10/15 seconds. The health of the shield can also be increased by these upgrades.

I believe 2 of the upgrades increase the health of the shield and 1 does increase the amount damage, that goes to the shield instead of your health.

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