So, I’m not sure now what the actually “type” the old 1E Monster Manual would have been, I always treated them as some sort of Fae (especially with the whole Boggart thing). In the new 5E Monster Manual however they are specifically a variety of Undead – probably in a quiet shout-out to the Dead Marshes.
Now, in my opinion this sort of monster always works better when the players can’t be sure what they are dealing with. As a result I had come up with two extra versions, one Celestial and one “good” Fae. So there is no good reason why I can’t keep them around for the same purpose.
In this version of the game I’d give them the same stats with the following differences:
Guardian Angel – Alignment is any good, instead of Consume Life it can use Beacon of Life (as the 3rd level spell) at will, the radius equal to it’s shed light radius (bright not dim). It’s damage for the shock attack is Radiant instead of Necrotic.
Fools Flame aka Fools Fire aka Fae Flame – Alignment is Chaotic Neutral, instead of Consume Life it can use a Hypnotic Pattern (as the 3rd level spell) at, the radius equal to it’s shed light radius (bright not dim). It’s damage for the shock attack is Psychic instead of Necrotic.
Now, you can mess with your player’s heads – and they (hopefully) won’t attack every single bobbing light they come across in the world. The substitute powers for Consume Life seem relatively balanced to me given how nasty that ability actually is in the new rules. I’ll get back to writing up world history now…