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Watchdog of Swordgrave

Investigate the Tricanus Ethereostasis Ray which was made by the dwarfs outside Swordgrave.
 

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Introduction

You told Brett why you are in the netherworld and why you need to get the Tyr Sword. It turns out Brett has a similar dream. Even though he is dead he never forgot that dream. Unfortunately Cerberus, Hades' loyal pet, guards Swordgrave. He has the blood of Fenrir, and is strong as Hypnos. Brett doesn't know how to deal with him, so they cannot enter Swordgrave.

NPC Dialog

So, you need to exchange the Tyr Sword for Minos'
token, which will allow you to enter the Temple of
Osiris? Your dream is even bigger than mine.
I wanted the power of the sword to stop the wars in
Dwarves' Forest. Like you I have never given up on
my goal. When we prepared to enter Swordgrave,
however, we met with a problem. Cerberus is
guarding Swordgrave! We don't know how we're
going to pass it, but maybe you will help us.

Quest Completion

There is a huge Tricanus Ethereostasis Ray on the
bridge to Swordgrave, but it lacks the energy to
function. There is a magic array behind the gun with
5 colors. You know Red is fire, Blue is water, Black
is dark, White is light...but what could Yellow be?