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W4R-D3N is a constructor miniboss that appears in Borderlands 2. It is the first constructor fought in the game and thus can tear apart attackers who are not prepared and are unaware of the constructor's array of deadly attacks. It is found after locating Roland inside of the Bloodshot Stronghold during the main story mission A Dam Fine Rescue. It will grab Roland and take him to the Bloodshot Ramparts, for extraction by Hyperion.
W4R-D3N has an orange shield which reflects all bullets while it is up, however it does periodically drop. The shield will only drop if an attacker is close enough to W4R-D3N. If they are too far away, it will be permanently engaged, and W4R-D3N will be nearly impossible to destroy.
W4R-D3N's weak spot is the red eye. Players using a sniper rifle will find this an easy target to score a number of guaranteed critical hits during each cycle of shield down-time. In addition, a critical hit while W4R-D3N is constructing another loader will interrupt the process and the loader will not spawn.
Shock weapons are recommended for maximum effectiveness against W4R-D3N's shields, and then corrosive weapons once the shields are depleted. Doing this, W4R-D3N can be dispatched with minimal trouble. W4R-D3N'S shields have a very low recharge delay and high recharge rate, so damage over time effects can assist in preventing the shield from recharging.
The Shrine of the Gunbringer behind W4R-D3N makes an excellent hiding spot as the loaders will rarely venture around W4R-D3N and it can only harm players by using a shockwave attack which can easily be avoided by stepping back. From this point, it is remarkably easy to take down W4R-D3N using explosive weaponry such as Torgue assault rifles as they will tear through W4R-D3N's shields and its armor rather quickly.
W4R-D3N can be defeated during its first appearance at Bloodshot Ramparts, however this is timed. If it is not destroyed in time, it will escape and take Roland to Friendship Gulag.
If it escapes the Bloodshot Ramparts, W4R-D3N will be found at the far end of Friendship Gulag. The path to W4R-D3N is full of loaders, including Badass varieties, and also human personnel. Once a path is cleared and W4R-D3N approached, it will start spawning more loaders, sometimes spawning a Badass version. The loaders must be dispatched quickly or they will quickly make an already tough boss fight overwhelming.