Oswin

## Stats

> *"Knowledge is paramount - We must acquire it by any means necessary."*
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> -Echo of The Magus
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**Oswin** is one of the Fallen Heroes of Io. He and his companions defeated DIV 500 years ago, sacrificing themselves to bring about the Age of Mortality.

## The Magus

Oswin is the patron Hero of knowledge and magic.

Those who worship his memory are said to pursue knowledge in all its forms, ever seeking new information and truths.

## Powers and Abilities

### Skill Proficiencies

* Arcana
* Investigation
* Sleight of Hand
* Stealth

#### Wizard Abilities

* *Arcane Recovery*
* Evocation Abilities
	+ *Evocation Savant*
	+ *Sculpt Spells*
	+ *Potent Cantrips*
	+ *Empowered Evocation*

#### Spell List

##### 4th Level

It is unknown what specific spells of this category Oswin knew.

##### 5th Level

It is unknown what specific spells of this category Oswin knew.

## Boss Mechanics

When fought as the boss named **Oswin of the Blackstar**, Oswin had the following abilities and spells:

### Powers and Abilities

* **Boosted Hit Points:** For this encounter, Oswin's bas Hit Points were boosted to equal 888.
* **Damage Immunities:** Oswin is immune to Poison damage.
* **Overchanneling Blackstar**: For every 111HP that Oswin loses, the next spell he casts will have the damage maximized.
* **Empowering Blackstar**: Oswin adds double his Int mod (12) to all damage done by spells.
* **Twelve Minutes to Midnight**: Every hit dealt to Oswin adds 1 to a counter. When the counter reaches 12, the current round and turn ends as Oswin casts the spell Time Stop. During this, he casts 1d4 spells, all taking effect when time resumes.
* **Sculpt Spells**: Any spell that Oswin casts are unable to hit himself.
* **Blackstar Preparation**: Oswin starts combat with an empowered Mage Armor spell, giving him an AC of 15 + dex mod. This also grants him an altered version of See Invisibility that also gives him Blindsight up to 120ft.
* **Blackstar Warcaster**: When a certain amount of damage is dealt to Oswin in a round, Oswin needs to make a Con saving throw to maintain concentration on his spells.
* **Evocation Mastery**: At the top of the round a 1d6 is rolled. Oswins elemental affinity changes to the element on the roll. A 1 is Fire, a 2 is Electric, a 3 is Cold, a 4 is Bludgeoning, a 5 is Necrotic, and a 6 is Force.
* **Blackstar Spellcasting**: All spells cast by Oswin are cast at a level equal to his Proficiency Bonus (4), or the actual level of the spell, whichever is higher.
	+ Any counterspells targeting one of his spells must beat a DC of 10 + the spell level, and Oswin gains a Vulnerability stack if the counterspell is successful. In addition, If the counterspell is a Nat 20, Oswin suffers a magical backlash, requiring him to make a save versus his own spell.
	+ All his spells become "save for no damage" and any class features that let you save for no damage instead let you fail for half damage. Oswin can cast the following spells:
	+ *Lightning Bolt* (9d6 Lightning, 100ft x 5ft Line)
	+ *Fireball* (9d6 Fire, 20ft Radius)
	+ *Dimension Door*
	+ *Cone of Cold (8d8 Cold Damage, 60ft Cone)*
	+ *Scorching Ray* *(5 Rays, 2d6 Fire Damage)*
	+ *Greater Invisibility (Concentration)*
	+ *Evard's Black Tentacles (Concentration)*
	+ *Protection From Energy (Concentration)*
	+ *Haste (Concentration)*
* **Condition Superiority**: At the top of the round, he may end a number of conditions and ongoing spell effects equal to his Proficiency Bonus (4).

### **Lair Actions**

* **Headmaster’s Study :** A 15ftx15ft square appears on the battlefield during the Phase Turn. It cannot be on any creatures.  At the Lair Turn, a cross formation lighting is cast out from all cardinal directions and height of the square.  Those in range must make a Dexterity Save, taking 18d6 True Damage on a failed save, or half on a successful one.
* **Atlas Library :** Half of the battlefield fills with snowy frost, becoming hindering terrain during the phase turn.  At the Lair Turn, the area fills with a violent snowstorm.  Those in the area must make a Constitution Save, taking 16d8 True Damage on a failed save, or half on a successful one.
* **Astari Jupiter Archives :** The effects listed happen in subsequent rounds, going back and forth between the two patterns.
	+ During the Phase Turn, a 5ft area black hole begins to form.  Every 5 Initiative, the black hole expands 5ft.  On the Lair Turn, the black hole becomes a cosmic event as the library rips asunder.  Those in the area effect must succeed at a Charisma Saving throw or be dealt 12d12 True Damage.
	+ During the Phase Turn, 4 - 5t area black hole begins to form in each corner of the room.  Every 5 Initiative, the black hole expands 5ft.  On the Lair Turn, the black hole becomes a cosmic event as the library rips asunder.  Those in the area effect must succeed at a Charisma Saving throw or be dealt 12d12 True Damage.

### Turns

* **Phase Turn:** This turn happens on an Initiative of 30. Depending on the area shifted to, the phase turn is different.
* **Spellcasting Turn:** This turn happens on an Initiative of 18. Oswin casts a Spell.
* **Move Turn:** This turn happens on an Initiative of 12. Oswin uses Dimension Door and casts a Spell.
* **Conjure Turn:** This turn happens on an Initiative of 6. Oswin casts a concentration spell.  Oswin can concentrate on multiple concentration spells. If Oswin is hit with an element that is his current affinity, he must make a concentration check at disadvantage equal to half of the highest damage source from that affinity, or 10. Upon failure, all his concentration spells end, and he suffers a vulnerability.
* **Lair Turn:** This turn happens on an Initiative of 1. Oswin uses a Lair Action. Depending on the area shifted to, the lair turn is different.

## Etymology

Oswin is an ancient masculine name, derived from the Old English words *"Os"*, meaning god, and *"wine"*, meaning friend.

## Trivia

* Oswin was the third and final corrupted Fallen Hero to be fought in Phase 2.
* Oswin is the first character in the Ioverse to undergo Reincarnation.
* One of Oswin's most powerful boss abilities, "Twelve Minutes to Midnight", is a refence to the Doomsday Clock, a metaphorical symbol that represents how close humanity is to a global man-made catastrophe.