Der Eisendrache quest help

[Cortland]

With 2 players, sometimes 3 or 4 we cannot seem to beat the Keeper at the end of the quest, once we taken out the 2 waves of Soldats, we begin shooting at the Keeper for the last time but doesn't seem to finish him and he instantly kills us all at once. We have attempted this quest hundred's of times and would like some help with last battle, or this is either an issue everyone is facing.

[Fate]

You need to put down the Ragnorak DG-4 otherwise you will do no damage to boss, which means that if you don't use the Ragnorak DG-4 in the middle you won't be able to see after 3-5 seconds you won't see his chest turn orange and that's when you can start damaging him.

If you don't put down your Ragnorak DG-4 he will just hit the bottom after 3-5 seconds, you would need to hide behind the pillars his shockwave instantly kills everyone.

[Cortland]

we do the ragnarok part, his chest is glowing orange and we fire, i did mention the last wave is when it happens.

[Fate]

Originally posted by Black Rabbit:

we do the ragnarok part, his chest is glowing orange and we fire, i did mention the last wave is when it happens.

Well on Wave 3, you have panzer doing it co-op. You must take out the Panzer first. but keep on eye on middle.

And if you guys die instantly it's most likely someone didn't put down their Ragnorak DG-4 in the middle and he does his shockwave which instantly kills everyone, if not behind a pillar.

Cause regardless if you didn't kill him on Wave 3, you just go another round until you finally do finish him off.

It should only take two DG-4's to take him down on Wave 1, 2, and 3.
Make sure you use the bows.

What I like to do is full charge one shot hit his chest and just spam left click.

[Cortland]

we used the haymaker and rayguns on him for the first and second waves, perhaps he can only fully die from arrows from the bows on the last time he glows?