Since Find Familiar is exclusively found on the wizard spell list , which means that by far the easiest way to gain a familiar is to simply be a wizard and pick Find Familiar as one of your 1st level spells.
Can anything be a familiar?
You gain the service of a familiar, a spirit that takes an animal form you choose: bat, cat, crab, frog (toad), hawk, Lizard, Octopus, owl, Poisonous Snake, fish (quipper), rat, raven, Sea Horse, Spider, or Weasel. Your familiar acts independently of you, but it always obeys your commands.
How does the find a familiar spell work?
The Find Familiar spell states that: While your familiar is within 100 feet of you, you can communicate with it telepathically. Your familiar acts independently of you, but it always obeys your commands. In combat, it rolls its own initiative and acts on its own turn.
How does a familiar transform into a chosen creature?
Your familiar transforms into the chosen creature. Finally, when you cast a spell with a range of touch, your familiar can deliver the spell as if it had cast the spell. Your familiar must be within 100 feet of you, and it must use its reaction to deliver the spell when you cast it.
Can a familiar cast a spell on itself?
It cannot cast your spells after all, it cannot use verbal commands to cast a spell, it cannot use the material components for you and it also cannot make the gestures you need to do with your hands. All of these are examples of what a spell might require you alone to do.
What kind of creature is a familiar in RuneScape?
Any spellcaster that can cast the find familiar spell (such as an archmage or mage) is likely to have a familiar. The familiar can be one of the creatures described in the spell, (see the Player’s Handbook) or some other Tiny monster, such as a crawling claw, imp, pseudodragon, or quasit.