Banishment's material component is silly

[LudicSavant]

If the party faces a T-Rex and the cleric decides to banish it, I can't think of any dinosaur specific banes out there

That's just because we need to learn more about dinosaurs!

We always need to learn more about dinosaurs.

[PhoenixPhyre]

That's just because we need to learn more about dinosaurs!

We always need to learn more about dinosaurs.

Except when it's time to run away from dinosaurs. Because dead people don't learn nearly as well as living ones, in general.

[Rukelnikov]

Except when it's time to run away from dinosaurs. Because dead people don't learn nearly as well as living ones, in general.

Larloch and Vecna disagree

[Lord Vukodlak]

In the past the special item wasn't required to cast the spell, it simply made it harder to resist. Its likely a carry over without the benefit.

If the party faces a T-Rex and the cleric decides to banish it, I can't think of any dinosaur specific banes out there and I don't think it would process why it should care about a shiny piece of metal being waved around or the caster's book of vogon poetry. That's where it starts to get wonky.

T-Rex's are strictly meat eaters so they should find and apple distasteful.

[Rukelnikov]

In the past the special item wasn't required to cast the spell, it simply made it harder to resist. Its likely a carry over without the benefit.

I don't remember in 2e, but I'm pretty sure it was necessary in 3e.

[JackPhoenix]

If the party faces a T-Rex and the cleric decides to banish it, I can't think of any dinosaur specific banes out there and I don't think it would process why it should care about a shiny piece of metal being waved around or the caster's book of vogon poetry. That's where it starts to get wonky.

What, you don't carry around a can of dinosaur repellent?

[stoutstien]

What, you don't carry around a can of dinosaur repellent?

Sure but it seems to attract the big one with a fin.

[Sigreid]

Except when it's time to run away from dinosaurs. Because dead people don't learn nearly as well as living ones, in general.

That's just your chance to learn about their digestive system.

[diplomancer]

small mammals are offensive to Dinosaurs.

[Dr.Samurai]

For dinosaurs, first you have to cast Meteor Swarm. Then that serves as the component for Banishment.

[Chronos]

I'd expect that there would be some smells that would be loathsome to a T. rex. What smell exactly, I have no idea, but given that they interacted with the world primarily through smell, if there's anything that would work, it'd have to be a smell.

That said, there's a severe shortage of living T. rexes in our world to study. In a world where they do exist, even if only on some distant continent, someone would have researched rex repellent, and a sufficient library should have some book on the topic. Heck, a druid could just turn into one, and figure out on her own what smelled really bad in that form.

Actually, come to think of it, one of my characters (a ranger) did meet a T. rex, once. I told the DM that, logically, the ranger ability to know what will make an animal less likely to attack, also means that I'd know what would make it more likely to attack (for strategic reasons, I wanted it to be chasing me). He ruled that I lit an arrow on fire and shot it in the nose. And you could probably rule that fire would be loathsome to most animals.

[Lord Vukodlak]

I don't remember in 2e, but I'm pretty sure it was necessary in 3e.

Nope it was optional.

Banishment 3.5
Arcane Focus
Any item that is distasteful to the subject (optional, see above).

[Rukelnikov]

Nope it was optional.

Well, it seems they changed it between 3.0 and 3.5

"To target a creature, the character must present at least one object or substance that it hates, fears, or otherwise opposes"

[JackPhoenix]

I'd expect that there would be some smells that would be loathsome to a T. rex. What smell exactly, I have no idea, but given that they interacted with the world primarily through smell, if there's anything that would work, it'd have to be a smell.

That said, there's a severe shortage of living T. rexes in our world to study. In a world where they do exist, even if only on some distant continent, someone would have researched rex repellent, and a sufficient library should have some book on the topic. Heck, a druid could just turn into one, and figure out on her own what smelled really bad in that form.

Actually, come to think of it, one of my characters (a ranger) did meet a T. rex, once. I told the DM that, logically, the ranger ability to know what will make an animal less likely to attack, also means that I'd know what would make it more likely to attack (for strategic reasons, I wanted it to be chasing me). He ruled that I lit an arrow on fire and shot it in the nose. And you could probably rule that fire would be loathsome to most animals.

We unfortunately don't know enough about dinosaur behavior, but being big solitary predators and scavengers, T. Rexes may have been territorial. If they marked their territory like animals today, urine or some sort of musk from another T. Rex may do the trick.

[VladSlavhinsky]

The problem could easily be solved by adding a material cost to the component, even if it is small. In this way, spring water is not enough to drive away an elemental, but a very pure water from a rare source would be needed, silver for certain fiends, cold iron for fairies, and the spirit of the spell would be preserved. It wouldn't even need to consume focus, so characters could start a collection of items to banish extraplanars (perhaps giving them disadvantage when using something adverse to that specific opponent, such as "the silver sword that defeated the devil centuries before")

[Telok]

Weapon bracelets for fighters that can be loaded up with all sorts of weapons to be pulled without cost or effort at any time. Armor earrings that summon your armor, ect...

AD&D, Rings of Readiness and Bracelet of Charms, Complete Fighter's Handbook. Pity WotC had to get rid of them, but fighters can't have nice stuff.

Re: banishment
I'm absolutely convinced there's some LG outsider that's sufficently prude to find a succubus distasteful, and since there's no listed cost...

[Witty Username]

I miss glove of storing every day.

[Bodyofstraw]

"An item distasteful to the target" is remarkably specific to a target you can choose on the fly. You apparently have all sorts of random items and can instantly pick out one that is distasteful to any given target from your spell component pouch without any difficulty! This one screams "you really should have an arcane focus, because the component is nearly impossible to have unless you planned for it specifically."

A quick pick of the nose and you're ready to go.

[Sigreid]

Larloch and Vecna disagree

They're only mostly dead

[Bohandas]

T-Rex's are strictly meat eaters so they should find and apple distasteful.

It also works on PC and Lunux users

[Bardon]

A small bag of excrement should cover the vast majority of creatures - beasts in general don't like the scent, most humanoids and the effete Fey and even fiends would likely not find it tasteful so therefore it's distasteful to just about everything.

If you find one of the very small number of creatures who like excrement, just have a bar of soap handy.

[Chronos]

Most creatures find their own excrement distasteful, but usually don't mind that of other creatures. If that's what you're going with, you'd still need a separate component for every enemy.