Osbirathanus
open-handed invoker, radiant caster of the winged host
Osbirathanus — The Encounter
open-handed invoker, radiant caster of the winged host · a boss your table can run with almost no prep. SRD 5.1-compatible.
Who Is Osbirathanus
Osbirathanus is the invoker of the Cult of Metatron, the herald whose open palm calls down the host's radiance from afar. While the swordsmen close, it climbs above the line and rains searing light on whatever the great eye has marked, its very hand merging with the wing of palms behind it as it channels. The cult names it a voice of fire, sent to soften the condemned before the blades arrive. It keeps to the air and to range, never trading blows it can avoid, and when its light snuffs out a foe it draws strength to climb higher still. Grounded and surrounded, the invoker's light gutters fast.
Run Osbirathanus in Sixty Seconds
- Kill-priority top of the list among casters; its radiant artillery shapes the whole fight from range.
- Open with Sundering Light down a line of clustered PCs, then Searing Bolt the back line.
- When bloodied Lift on Hands away every turn and keep blasting rather than risking melee.
- Three ways to run it aerial artillery softening marks, line-blaster punishing clusters, or a skirmishing caster that kites and climbs on kills.
Osbirathanus
Medium celestial, lawful neutral
CR 7 · 2,900 XP · GUIDELINERadiant Invocation. Osbirathanus's weapon and spell attacks count as magical. When it reduces a creature to 0 hit points with radiant damage, it gains 5 temporary hit points.
Hand-Borne Flight. Its wings are a fan of grasping hands; while flying, it has advantage on Dexterity saving throws against effects it can see.
Actions
Multiattack. Osbirathanus makes one Verdict Sword attack and uses Searing Bolt once.
Verdict Sword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) slashing damage plus 4 (1d8) radiant damage.
Searing Bolt. Ranged Spell Attack: +7 to hit, range 120 ft., one target. Hit: 18 (4d6 + 4) radiant damage.
Sundering Light (Recharge 5-6). A 30-foot line of radiance bursts from its raised hand. Each creature in the line makes a DC 15 Dexterity saving throw, taking 27 (6d8) radiant damage on a failure, or half as much on a success.
Bonus Actions & Reactions
Lift on Hands. Osbirathanus flies up to 20 feet without provoking opportunity attacks.
A helmed herald raising one open hand that blazes with light, sword lowered in the other, lifted by wide wings of grasping celestial hands.
Guideline numbers — formula-tuned and read from the miniature's design, not yet table-proven. Tell us how it ran in the comments.
How It Fights — by Tier
Same creature, scaled threat. The traits never change; only the numbers move.
Stay aloft at range and bolt the squishiest hero while the swordsmen engage. Loose Sundering Light when two foes line up. Never melee; let the flock screen you.
Open with Sundering Light across the clustered party, then alternate Searing Bolt at the back line and Lift on Hands to keep distance. Soften marked targets for the heralds to finish. It is the host's artillery, not a duelist; keep wingmates between it and the party.
Hover at maximum range, recharge Sundering Light onto formations, and pick off casters with Searing Bolt. Use kills to gain temp HP and climb away from melee. Always fight as the flock's ranged support, never solo.
Put Osbirathanus on the table
Download the presupported STL and run the fight tonight — the model, and the encounter that comes with it.
Get the STL on MyMiniFactory →Clay Cyanide Companion Rules v1
How a bound creature acts
- A companion acts on its owner's initiative, immediately after the owner.
- It uses the Companion block above — roughly ×0.6 HP and damage, no recharge abilities, and at most one reaction trait.
- It moves freely; it takes its Action only while its owner is conscious.
- At 0 HP a companion is broken, not dead — restored on a long rest unless your table rules otherwise.
Original Clay Cyanide material © Clay Cyanide LLC — explicitly not the non-SRD official sidekick rules.
Questions, Asked at the Table
What CR is Osbirathanus?
Native Challenge Rating 7 (2,900 XP) at Tier 2. Tier 1 (~CR 2) and Tier 3 (~CR 11) stat lines are included to match your party.
How does Osbirathanus fight alongside the rest of the Cult of Metatron?
It is the host's ranged artillery. It blasts and softens whatever target the eye and standard-bearer have marked while the swordsmen close to finish. It is an elite caster, not a boss; field it behind a screen of heralds.
Is it a spellcaster?
It uses radiant invocations rather than a prepared spell list, modeled as SRD-style spell attacks and a recharge line attack. It is a celestial invoker, with no proprietary spells or creatures involved.
Tell Us How It Ran
This work includes material taken from the System Reference Document 5.1 ("SRD 5.1") by Wizards of the Coast LLC and available at dnd.wizards.com/resources/systems-reference-document. The SRD 5.1 is licensed under the Creative Commons Attribution 4.0 International License available at creativecommons.org/licenses/by/4.0/legalcode.
Clay Cyanide Miniatures is not affiliated with, endorsed, sponsored, or specifically approved by Wizards of the Coast LLC. This content is compatible with the fifth edition of the world's most popular fantasy roleplaying game. Companion rules, lore, names, and original mechanics © Clay Cyanide LLC.
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