Battle: specialized in basic magic from different schools.
Abilities:
Transmutation: has the ability to convert spell scrolls in a pedestal into other random scroll of the same rarity, and there's a little chance to get a higher rarity scroll.
Enderman's Nightmare: enderman are scared of him, and will run away when seeing him.
Shulker Protection: has the ability to counter shulker bullets.
Spawn: can be found wandering around in the End, studying the limits of the existence.
Battle: specialized in attacking enemies with arrows, combined with swift moves.
Abilities:
Watcher: has the ability to protect the owner from enemies aiming at him, even if the owner has not noticed them.
Smelling Loot: the owner can right click him with any item to make him search for entities around that can drop them, marking them for the owner to see.
Spawn: can be found searching for preys in forests.
Battle: specialized in poison magic, poisoning enemies to make them suffer a slow death.
Abilities:
Poison Blood: his owner and himself deal increased damage to poisoned entities, and when a plague doctor familiar gets hit, they throw a poison potion as countermeasure.
Spawn: to get him, you will need to craft a poison vial and give it to a tamed druid familiar.
Magic Leaf: right click into a druid familiar to bind him, equip in the necklace slot to be able to summon/unsummon the bound familiar with its keybind, found in Jungle Temples.
Chain of the Hunter: right click into a hunter familiar to bind him, equip in the necklace slot to be able to summon/unsummon the bound familiar with its keybind, found in Evoker Forts.
Insignia of the Lich: right click into a necromancer familiar to bind him, equip in the necklace slot to be able to summon/unsummon the bound familiar with its keybind, found in Ancient Battlegrounds.
Forgotten Crown: right click into a summoner familiar to bind him, equip in the necklace slot to be able to summon/unsummon the bound familiar with its keybind, found in Ancient Cities.
Shiny Crown: right click into an archmage familiar to bind him, equip in the necklace slot to be able to summon/unsummon the bound familiar with its keybind, found in Mountain Towers.
Golden Bell: right click into an illusionist familiar to bind him, equip in the necklace slot to be able to summon/unsummon the bound familiar with its keybind, found in Woodland Mansions.
Conjurer's Candlestick: right click into a scorcher familiar to bind him, equip in the necklace slot to be able to summon/unsummon the bound familiar with its keybind, found in Pyromancer Towers.
Blessed Calyx: right click into a cleric familiar to bind him, equip in the necklace slot to be able to summon/unsummon the bound familiar with its keybind, found in Priest Towers.
Emblem of Electricity: right click into a lightning mage familiar to bind him, equip in the necklace slot to be able to summon/unsummon the bound familiar with its keybind, found in Mountain Towers.
Contaminated Cheese: right click into a plague doctor familiar to bind him, equip in the necklace slot to be able to summon/unsummon the bound familiar with its keybind, found in Impaled Shipwrecks.
Lost Melody: right click into a bard familiar to bind him, equip in the necklace slot to be able to summon/unsummon the bound familiar with its keybind, obtained from the Mysterious Orb.
Ring of Familiar Revival Core: +5% mana regen, essential material to craft the Ring of Familiar Revival, found in Catacombs.
Ring of Familiar Revival: +10% mana regen, when equipped allows tamed familiars to escape death at the cost of your own mana, crafted.
Holy Water Grail: +5% mana regen, constantly heals tamed familiars at the cost of your own mana, found in Priest Towers.
Invisibility Robes: +50 max mana, when equipped tamed familiars that fall below 25% health willl get invisibility effect, crafted.
Statue of Willpower: +20% spell resist, when equipped tamed familiars that fall below half health will get oakskin effect, crafted.
Heart of Ender: +15% cast time reduction, when equipped familiars that fall below 25% health will get evasion effect on intervals, found in End Cities.
Broken Shield: right click into a tamed familiar to allow him to block attacks with a low chance, limit 1 per familiar, found in Blacksmith Structures.
Life Gem: right click into a tamed familiar to boost his health permanently, limit 10 per familiar, crafted.
Rusty Helmet: right click into a tamed familiar to boost his armor permanently, limit 10 per familiar, dropped from Ancient Knights.
Strange Mushroom: right click into a tamed familiar to give him a stack of enraged (when getting hit, has a chance to consume a stack of enraged to gain heartstop for some seconds), limit 10 per familiar, dropped from Mooshrooms.
Poison Vial: used to transform a tamed druid familiar into a plague doctor familiar, crafted.
Pandora's Box: can be used to store and release multiple familiars at the same time, crafted.
Venomous Spider Fang: used to craft poison vials and heal plague doctor familiars, dropped from Cave Spiders.
Familiar Tome: used to store and release a single familiar of any kind, and can be put into a familiar bed to heal the stored familiar over time.
Familiar Bed: used to heal familiars stored in a familiar tome over time.
Mysterious Orb: when right clicking it you will get the Harp and the Lost Melody trinket, dropped from the Dead King.
1.21.1 only: to be able to use the Mysterious Orb, you will need to complete the taming advancements for the elemental familiars (all of them except the bard familiar).