The Champion’s HP bar is reinforced for X Turns with a Shield effect of X HP.
The X factor may be determined by this champion's HP or that of the one bestowing the shield depending on the shield's source.
Damage is calculated normally but will generally be applied first to the Shield
Some attacks ignore Shields depending on the attacker and the skill being used
When the buff expires or the Shield value reaches 0, the Shield is removed and further damage applies as normal.
Shields and Lifesteal (et.al.)[]
Since damage dealt to the shield does not count as damage dealt to the Champion, attackers using Lifesteal Sets do not benefit from it to the degree that the shield is consumed first.