Is a Pact of the Chain Warlock’s quasit familiar really this effective as a spy?

One of my players has a Warlock with the Pact of the Chain. This PC has a quasit familiar. If we are applying the rules correctly…

Pact of the Chain

You learn the find familiar spell and can cast it as a ritual. The spell doesn’t count against your number of spells known. When you cast the spell, you can choose one of the normal forms for your familiar or one of the following special forms: imp, pseudodragon, quasit, or sprite. […]

Find Familiar

[…] While your familiar is within 100 feet of you, you can communicate with it telepathically. Additionally, as an action, you can see through your familiar’s eyes and hear what it hears until the start of your next turn, gaining the benefits of any special senses that the familiar has. During this time, you are deaf and blind with regard to your own senses. As an action, you can temporarily dismiss your familiar. […]

VARIANT: QUASIT FAMILIAR […] Familiar. The quasit can serve another creature as a familiar, forming a telepathic bond with its willing master. While the two are bonded, the master can sense what the quasit senses as long as they are within 1 mile of each other. While the quasit is within 10 feet of its master, the master shares the quasit’s Magic Resistance trait. At any time and for any reason, the quasit can end its service as a familiar, ending the telepathic bond.

… then he can communicate with it within 1 mile and see what it is seeing.

For example, in a mission where PCs have to peek at the enemy camp, he could just stay hidden and send the quasit exploring the camp. The quasit can turn invisible and polymorph into a centipede, so it can go anywhere (even inside a building), and the Warlock can see everything.

Now, is this correct? It would seem really overpowered to me.

If it’s correct, how can I limit this power in an acceptable way?

How should my Warlock player use their familiar during battles?

One of my players has a Warlock character and is using Pact of the Chain for their Pact Boon. They most often cast a pseudodragon as their familiar, but neither of us are sure about how they should be using the pseudodragon during fights. Does the familiar get its own turn in the turn order? Or can the familiar only act when the Warlock gives up their action slot? I read the PHB content, but I’m still unclear how/if the pseudodragon should be used in fights.

How to calculate the delivery of a touch spell using the familiar?

Familiar Conduit text reads

Under your tutelage, your familiar has grown attuned to the hidden currents of the world and can serve as a conduit for your magic. If the next action you use is to Cast a Spell that has a range, the spell uses the familiar as its origin point.

Touch is a range, but familiars do not have the required stats to make an attack. How does one calculate the success or failure?

What can make a dragon familiar suitable for a low-level character?

I would like to allow a level ~5 character to have a dragon as a familiar. (My DM style is a little more flexible.) Other than having a “baby dragon,” how would you keep that balanced? I’d also appreciate any advice about running a dragon-assisted campaign.

Addendum: What if I just reduced the HD, and restricted a few abilities? Example, too young to fly, but intelligent to talk and give additional reasoning. Randomly remove a spell-like ability, and/or supernatural ability.

Would I be restricting the player too much, by actually turning the dragon into a pet she needs to take care of, rather than an independent familiar?

Improved Familiar + Valet archetype?


Deliver Aid (Ex)

[…]

This ability replaces speak with animals of its kind.

http://www.d20pfsrd.com/classes/core-classes/wizard/familiar/familiar-archetypes/valet-familiar-archetype

[I]mproved familiars do not gain the ability to speak with other creatures of their kind […].

http://www.d20pfsrd.com/feats/general-feats/improved-familiar

Can an Improved Familiar take the Valet archetype?

The Valet archetype is not the only one that replaces that ability, so this question applies to more than just that archetype.

Can a familiar give orders to minions of their wizard?

A wizard has a familiar and some other minions. Let’s go with a summoned monster and a non-intelligent undead minion. Can the familiar give commands to these other minions?

Does it matter if the wizard is present? (Like if they get teleported away) Does it matter if the wizard is conscious? Does it matter if the familiar can speak? Does it matter if how the wizard is controlling the undead (create undead vs command undead)?

Any other edge cases one can think of?

Is a familiar compelled when their wizard is?

I have a party and an aboleth dominated them (only two players present). The aboleth didn’t do anything to the wizard’s familiar. Does the wizard’s familiar get affected by the compulsion effect too? Would a familiar always know if their wizard was affected by a compulsion? (In my case the aboleth was out of view and hearing when casting)

In play I ruled that the familiar could act freely, as it had a reasonable intelligence score (Int 8 for wiz level 5). It tried to save its wizard but failed. Eventually the aboleth told the wizard to reign in their familiar. Now the party has a new subterranean "quest giver."

Would a bat familiar have a passive perception of 16 in most cases?

In its stat block a bat is shown to have a passive perception of 11; the standard 10 plus wisdom. However, the bats ability Echolocation states that it "can’t use its blindsight while deafened", which heavily implies that the bat relies on hearing for detection. This married with its other ability Keen Hearing which says that a bat has "advantage on Wisdom (Perception) checks that rely on hearing" and the knowledge that advantage on perception checks also translates to a +5 to passive perception makes me think that barring special cases (such as perception checks that rely on detecting a certain smell), a bat should be treated as having a passive perception of 16.

Is this correct, or is there a reason a bats perception would stay at 11?

Can subtle spell be used through a warlock’s familiar, and does it stop the stealth from being broken if it is currently sneaking [duplicate]

With the new Tasha’s Cauldron of Everything feat Metamagic Adept, warlocks get access to Subtle Spell. Can Subtle Spell be used in conjunction with a chain warlock’s familiar to cast, say, death ward at range without someone knowing?

How do i scout with a bat familiar?

My gaming group in a few encounters will be hitting level 14. I plan on taking the arcane familiar feat, and choosing the bat familiar. My plan is to have the bat passive inside my cloak to gain the benefits of its blindsight while scouting around for my party. Assuming I myself am hidden, would i still need to roll for the bat using my modifiers? And would i have to have the bat on my shoulder for its blindsight to even work?