The Judge of Yama is using the Protect from Missiles and Magic prayers simultaneously, and is also immune to the Ancient godsword special attack, all forms of recoil, and both poison and venom. It thus must be fought with Melee. It will also use melee attacks, and can occasionally teleport players farther away down the docks followed by throwing fire waves that takes up 3 squares, similarly to the tsunami attack by Galvek. As the pier is 4 squares wide, players can avoid it by going to the side with the gap and making their way back to the Judge of Yama. This will be repeated until it is defeated.
When fighting the demon, the best tactic is to use the Protect from Melee prayer and tank the flames until you get in melee range. After this he will not attack you with flames until he teleports you away, simply dodge the flames to get back in melee range or tank them if you are able to. Repeat this process until it is defeated.
The Judge of Yama is considered a greater demon for the purpose of a Slayer task. As Judge of Yama is a demon, Arclight can be used to effectively defeat it.
Gallery
Concept art by Mod Grub illustrating the Judge of Yama.
Slayer info
File:Konar chathead.png 
Combat stats
Magic defence
Ranged defence
Concept art by Mod Grub illustrating the Judge of Yama.
Fighting the Judge of Yama.
