The Demon of Light was a Saradominist demon who had to be defeated in order to obtain a demon's heart for Kolodion's spell during Mage Arena II miniquest. In order to summon it, players had to use an enchanted symbol to locate it, similar to using an enchanted key or strange device.
It was replaced by Justiciar Zachariah on an update on February 8th 2018.
It was recommended to keep Protect from Magic active during the entire fight. Even though it was able to hit through it, the damage players took would be halved. If players were assigned a black demon for their Slayer task, wearing a slayer helmet (i) was recommended, as the player's attacks would be more accurate.
The demon could only be harmed by the Saradomin Strike spell or the twisted bow. As such, a Saradomin staff was required to defeat it if using magic.
If not slain quick enough, the demon would despawn and the player would have to track it again and restart the fight.
If the player slayed the demon as part of a black demon Slayer assignment given by Krystilia, it would not have a chance of dropping a Slayer's enchantment or mysterious emblem.
- The quest journal stated prior to starting the miniquest "I must be able to defeat multiple level 257 demons", even though they are actually level 202.
- ^ Jagex. Mod Ash's Twitter account. 29 November 2017. (Archived from the original on 28 May 2020.) Mod Ash: "[if assigned black demons by Krystilia, do the new Mage Arena II quest demons have a chance of dropping slayer's enchantment/mysterious emblem?] I don't think so."