18 - an unsend letter for the party, asking for help to recover their house as a bandit group kicked them out of it

How to roll 100:

1. take 10 sided die, roll once
2. take that number and multiply by 10
3. roll 10 sided die again
4. add that to the number from #2
5. add 1 (otherwise it would be 0-99, not 1-100)

How do you get “1” like this?

I suppose you have to roll 10 to get to 100 = 0

But then what?

Modify step 2 so you subtract 1 from the roll first, then multiply by 10. That way if you roll a 1, the 10's digit becomes a 0.

Alternatively:

Roll a percentile die and a d10 together. Done.

A letter that reads:

"Dad

I know things were hard for you when mum died but I know we can get though this together.

I'll see you at the funeral.

Love from Anita"

Last name MakeaWillSaveOrTakePsychicDamage?

that's exactly what I said, also you'd still need to add 1 to make rolling 100 possible

Well, no, that's not exactly what you said. And rolling with a percentile die means you do not need to add anything. A result of 00 and 0 is the 100. And your way makes rolling a 1 impossible.

A small puppy, obviously killed by the same blow that finished off the victim.

"I strike at the bandit with my axe"

"Give me a to hit roll"

"Natural 20!"

"You cleave both targets in half, blood sprays everywhere!"

"Both targets?"

5 - As the goblin lays facedown in a pool of blood. You discover a bucket full of candy and a cracked plastic mask with the same expression of the goblin you just fought.

Then you switch to a system where you don't add the 1, interpreting 00 as 100

Extra points if the slain party is a guard or other law enforcement official.

Nice. Let's balance this out a bit at the other end:

98 - A scroll containing a detailed plan to burn down the nearest orphanage.

99 - Pockets full of napkins inscribed with insane anti-gnome racist gibberish.

100 - A magic communication stone that, if activated, creates a magic audio connection with the lead villain of the current story arc.

I'd just turn it into a running joke that roughly 50 different bandits have the same picture of the same woman in a locket, and another 30 keep sending money to the same "mother". Then I'll make a cult where the phrase "For the light in my darkness" is some twisted mantra.

Wouldn't that give you 11-100?
l
The Lowest number on a dice is 1, and 1×10 gives you 10.

The formula would have to be

((d10-1)×10)+d10=x≥90⟹y=(y+1)⟹z>1(d2)

So you'd still have to flip a coin on reaching a result of 90+ in order to know if you add a +1 or not as well or else you can't get 90 as a result either.

(This is assuming you have a d10 that's 1-10 btw and not 0-9!)

Then you get 1 to 99

Anti-gnomery isn't bad.

100 - “ICE” patches.