Sources
CR
Type
Size
Alignment
Movement

Iona

Large Celestial, Lawful Good

Armor Class 21 (natural armor)
Hit Points 243 (18d10 + 144)
Speed 50 ft., fly 150 ft.
STR
26
+8
DEX
22
+6
CON
26
+8
INT
25
+7
WIS
25
+7
CHA
30
+10
Saving Throws INT +14, WIS +14, CHA +17
Skills Perception +14
Damage Resistances radiant; bludgeoning, piercing, slashing, from nonmagical attacks
Damage Immunities necrotic, poison
Condition Immunities Charmed, Exhaustion, Frightened, Poisoned
Senses truesight 120 ft., passive Perception 24
Languages all, telepathy 120 ft.
Challenge 21 (33,000 XP)

Traits

Angelic Weapons. Iona's weapon attacks are magical. When the solar hits with any weapon, the weapon deals an extra 6d8 radiant damage (included in the attack).

Divine Awareness. Iona knows if it hears a lie.

Magic Resistance. Iona has advantage on saving throws against spells and other magical effects.

Spellcasting

Innate Spellcasting. Iona's spellcasting ability is Charisma (spell save DC 25). It can innately cast the following spells, requiring no material components:

At will: detect evil and good, invisibility (self only)

1/day each: commune, control weather

3/day each: blade barrier, dispel evil and good, resurrection

Actions

Multiattack. Iona makes two greatsword attacks.

Greatsword. Melee Weapon Attack: +15 to hit, reach 5 ft., one target. Hit:22 (4d6 + 8) slashing damage plus 27 (6d8) radiant damage.

Slaying Longbow. Ranged Weapon Attack: +13 to hit, range 150/600 ft., one target. Hit:15 (2d8 + 6) piercing damage plus 27 (6d8) radiant damage. If the target is a creature that has 100 hit points or fewer, it must succeed on a DC 15 Constitution saving throw or die.

Flying Sword. Iona releases its greatsword to hover magically in an unoccupied space within 5 feet of it. If the solar can see the sword, the solar can mentally command it as a bonus action to fly up to 50 feet and either make one attack against a target or return to the solar's hands. If the hovering sword is targeted by any effect, the solar is considered to be holding it. The hovering sword falls if the solar dies.

Healing Touch (4/Day). Iona touches another creature. The target magically regains 40 (8d8 + 4) hit points and is freed from any curse, disease, poison, blindness, or deafness.

Legendary Actions

Teleport. Iona magically teleports, along with any equipment it is wearing or carrying, up to 120 feet to an unoccupied space it can see.

Searing Burst (Costs 2 Actions). Iona emits magical, divine energy. Each creature of its choice in a 10-foot radius must make a DC 23 Dexterity saving throw, taking 14 (4d6) fire damage plus 14 (4d6) radiant damage on a failed save, or half as much damage on a successful one.

Blinding Gaze (Costs 3 Actions). Iona targets one creature it can see within 30 feet of it. If the target can see it, the target must succeed on a DC 15 Constitution saving throw or be blinded until magic such as the lesser restoration spell removes the blindness.

Lore

The angels of Zendikar are living manifestations of white mana, and they embody its inherent tendencies toward morality and order. Peace and harmony are their goals, though they are more concerned with reestablishing the natural order of the plane than with interfering in disputes between the lowly mortal races. Angels appear similar to female humans possessing two, four, or six feathered wings. Their eyes glow with inner light, and glowing golden rings surround their heads—usually positioned…