This new shield system breaks the balance of the game in PVP. It has no counter, no health bar, can't be damaged and can be turned on at any time. It is a completely broken system that makes PVP impossible on servers. I cannot believe that in 4+ years of developing this game Keen that you have not managed to find the time to increase the amount of available weapons to more then 2 or contribute in any other meaningful way to the PVP side of the game but you can find the time to add some dumb invulnerability system that completely stops dead proper PVP. The shield at a bare minimum needs a counter, either a way for an attacker to either ware it down or do some other action to have a chance of disabling it. Invulnerability is a cheap broken mechanic in any game, especially one that is a "survival" game. Sort this out fast before you lose your PVP player base.