Four-Handed Dervish. Ydran can wield two sets of weapons and shields, as well as use any of her four arms for spellcasting somatic components.

Unarmored Defense. While Ydran is wearing no armor and wielding no shield, her AC includes her Wisdom modifier.

Legendary Resistance (5/Day). If Ydran fails a saving throw, she can choose to succeed instead.

Multiattack. Ydran makes four attacks. She can replace one of these attacks with a use of her spellcasting.

Whirling Dervish. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 28(6d6 + 7) slashing damage. The target must succeed on a DC 22 Constitution saving throw or have its speed reduced to 0 until the start of Ydran's.

Spellcasting. Ydran casts one of the following spells, requiring no material components and using Intelligence as the spellcasting ability (spell save DC 23, +15 to hit with spell attacks):

At will: mage hand, message, prestidigitation, thunderwave, vortex warp

3/day each: dispel magic, haste, polymorph, shield

1/day each: Bigby's hand, destructive wave, draconic transformation, maze, foresight, wish

Ydran can take up to four reactions per round but only one per turn.

Spellsunder. Ydran cuts through the song of magic to interrupt a creature she can see that is casting a spell. If the spell is 4th level or lower, it fails and has no effect. If the spell is 5th level or higher, Ydran makes an Intelligence check (DC 10 + the spell’s level). On a success, the spell fails and has no effect. Whatever the spell’s level, the caster takes 10 (3d6) psychic damage if the spell fails.

Savage Riposte. In response to being missed by an attack Ydran teleports, along with any equipment she is wearing or carrying, up to 60 feet to an unoccupied space she can see within 5 feet of her attacker, and makes two Whirling Dervish attacks.

Spell Thief (Recharge 6). If a spell is cast and targets one or more creatures, Ydran makes an Intelligence check contested by the caster's ability check using its spellcasting modifier. On a success, she identifies the spell and the creatures it targets are unaffected, and instead she chooses a different creature within range to be affected instead. If the spell requires concentration, she concentrates on it instead of the original caster. If there is a saving throw required, the DC is 23.