Mafia 105. Raid of the Damned

Basically,

Shirach - Hitler Youth - NSDAP - Neo-Nazism - Nazi symbols - Runes - Norse mythology - Ragnarok

Backwards:
Ragnarok Online - Norse mythology - Runes - Hitler Youth - Shirach

I'm sure the first chain could be made even shorter. There are so many connections there, both through the skull and through the stormtroopers—and it all leads to Nazi symbols with runes.

Added after 2 minutes

I'm speechless... Master, what's wrong with you? In your last mafia game, you boasted that you always had clear forward and backward links. And it seemed that was the case. And now you're saying it's not necessary? x(

If you were actually analyzing the clue instead of zealously defending somaf, you would have figured out the correct solution yourself long ago based on my lead. As for you, everything is clear; you don't need to try any further. Study the killer's clue; your team will need to kill him tonight.

Added after 1 minute
Now I see no need to make a triple day