Part of the fun of developing adventures like Gareth Ryder-Hanrahan’s Red Crag Castle section of Book of Demons is adding monsters that complete the theme. Sometimes those missing bits turn out to be things that fill a gap in all of 13th Age, not just the one adventure.
That turned out to be true for the demonic forces that guard the hellhole centered on Red Crag Castle. One of the demonic factions is all about swords, steel, and a sadistic impression of military discipline. A sword-sword-sword (etc.)-wielding marilith-style demon seemed like a natural fit, but our mariliths are epic 12th level creatures, far too powerful for the champion-tier environment of Red Crag Castle.
What was needed was a 7th level version of something like a marilith. As I poked around our monster lists, I realized that we had precious few normal-sized demons at 7th level, and nothing that could stand in for a melee troop. So I added the minor serpent demon to Redcrag Castle, along with a couple of other generally-useful demonic warriors.
This minor serpent demon uses the same core mechanics as the marilith. It’s useful enough that I think it deserves to be in 13th Age monster lists that might not normally pay attention to demons in specific adventures. I’m going to reprint its stats here, along with two other stat blocks for demon warriors that could physically resemble the minor serpent demon and the marilith, or could be reskinned as you require.
To make them more useful, I’ve placed the new demons on either side of the 7th level minor serpent demon, and designed them for different roles. As you’ll see, each of the demons has a different approach to the question of how to force magically-competent enemies into melee, and how to punish enemies once they’re engaged. The minor variations in stats and abilities are deliberate. They should team up well with each other.
Minor Serpent Demon
Progressing sword by sword and death by death toward a full marilith.
7th level troop [demon]
Four whirling swords +12 vs. AC (4 attacks)—7 damage
Miss: 2 damage
C: Beguiling gaze +12 vs. MD (one nearby or far away unengaged enemy)—As a free action, the target immediately moves toward the minor serpent demon, attempting to engage it or get as close as possible to it
Limited use: 1/round, as a quick action.
Terrible swords: When the escalation die is even, the minor serpent demon’s crit range with melee attacks expands by a number equal to the escalation die.
PD 16 HP 98
Serpent Demon Slasher
A one-on-one fight may be the best way to face this demon, but is it really one-on-one when she wields three massive two-handed swords?
6th level wrecker [demon]
Three two-handed swords +10 vs. AC (3 attacks)—7 damage
Six-handed devastation: The serpent demon slasher gains a bonus to its attacks equal to the number of different enemies that it has attacked or been attacked by this battle; maximum +6.
PD 17 HP 94
You know how you’re supposed to keep your eye on the enemy’s blade? Don’t.
8th level blocker [demon]
Churning swords +13 vs. AC (2 attacks that add the escalation die as a bonus)—14 damage
If both attacks hit: Bladeweaver demon can use deadly swords attack below.
Deadly swords +13 vs. AC (2 attacks)—16 damage
Miss: 8 damage
Limited use: 1/round, as a quick action and only when triggered by churning swords.
Terrible compulsion: Each round, the first enemy that misses the bladeweaver demon with an attack when it is not engaged with the bladeweaver demon must immediately move toward the bladeweaver as a free action, attempting to engage it or get as close as possible to it.
PD 18 HP 124