Sprix (5e Creature)
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Tiny fey, neutral
Fairy's Immunity. The sprix has immunity to a type of damage based on the element that it represents (choose or roll a d10): 1-2, acid (acid); 3-4, fire (fire); 5-6, bludgeoning, piercing, or slashing (metal); 7-8, X (X); 9-10, X (X).
Personal Realm. A sprix can teleport itself and up to two others at any one time to a personal demiplane. This plane is a 15-foot cube. This realm can look however though usually, it is related to the sprix's element. Anything stored in the plane stays there even if the sprix dies (need planar travel spell to access when sprix dies) making it a useful storage space for spell casters who have this familiar.
Become Weapon. A sprix can become a weapon at will. If a sprix is used as a familiar it can become a weapon its user is proficient in. The weapon is only considered magic for detect magic and for trying to destroy the weapon.
Flyby. The sprix doesn't provoke an opportunity attack when it flies out of an enemy's reach.
Slash. Melee Weapon Attack: +2 to hit, one target. Hit: 4 (1d4 + 2) slashing damage.
A small elf-like creature with solid colored eyes and a monochrome color scheme on its natural body. A sprix represents one element, for example, fire, acid, or metal. Sprix are common as familiars in weapon wielding spell casters. Sprix have immunity to a damage type related to their element.
Sprix are based off of Spren from the Stormlight Archive series by Brandon Sanderson.