#if you cant handle that you're welcome to abort whenevs

[gay-jesus-probably]

I realize Undertale's been out for like 7 years now, but with the new Deltarune chapter, some people might wanna go try and take a stab at Undyne the Undying and Sans. To which I say, that's extremely valid, they're painfully difficult but so satisfying to beat. Even if it is an emotional rollarcoaster to get there.

As a genocide run veteran, bit of useful advice:

Save the best food for Sans. Snowman pieces can be used on Undyne if you really want, but they're best saved for Sans. Pie should NEVER be used on Undyne; it's the only item that'll always take you back up to 92 hp, so it's a waste on Undyne.

Grinding all the kills in each area is annoying. The quickest method is to head straight to the last room with encounters in that area, go to the top wall, and just hold the up and down keys at the same time. You'll sort of wiggle around in place, which farms encounters super fast. Once you've finished killing, you can roll right on out of there with minimal interruptions. Yes, the farming looks silly; we call it the Murder Dance.

Don't worry about money; you can't buy temmie armour on a genocide run. Gerson and Burgerpants are the only people that'll sell to you anyways. Attack and defense only ever matter against Undyne, and you'll just want the dusty tutu and ballet shoes for her.

Undyne the Undying always does the same attacks on turns; for example, she turns you red again on turn 3. After a few tries, you'll start getting a good feel for it. I recommend taking notes as you go; it helps to know exactly what you're about to be dealing with each turn. Make sure to mark which turns you find difficult to dodge, so you know when you absolutely need full health going into a turn.

You can technically take notes for Sans as well, but after you get past the fake spare, he starts hitting you while its your turn, so the second half of the fight you don't have time to check notes. Best to just get used to muscle memory with him.

Sans hits for 1 hp per frame, with karma damage as an extra fuck you to drain your health, and dodges every attack. Chara's locket and knife are worthless to you; the best gear for the Sans fight is the Cloudy Glasses, and the best weapon is either the Torn Notebook or Burnt Pan. The burnt pan makes food heal you a little more, which is helpful, while the glasses and notebook give you a little bit of i-frames. It's not much, but it makes a world of difference; just the glasses makes you invincible every fourth frame, while glasses and notebook makes it every third frame. Normally, Sans can hit up to 30 hp in a second, but with glasses and notebook equipped that's reduced to 23 hp per second. The glasses and notebook equipped together will also make KR drain your health slower, giving you a better chance of surviving each turn. If you want the glasses and notebook, make sure to buy them from Gerson as you go past, because backtracking through a dead area takes a fucking century with 'but nobody came' interruptions every five seconds.

Pie and Instant Noodles should NOT be used in the first half of the Sans fight unless you're still learning the ropes and want more time alive to practice. If you're making a serious run at victory, the pie and noodles are for the second phase; scrolling through the menu can drain your health to 1, so you need the full heals to make it worth it.

Sans will keep 'sparing' you until you take the bait or attack. This is the final checkpoint; after that, he starts attacking you in the menu, so you'll need to be 100% ready to go for the rest of the fight. Heal up (NOT with the pie or noodles, unless they're all you've got left), stretch, have a drink, tie your hair back, adjust the volume, scratch your nose, go to the bathroom... do whatever you need to be ready for the most intense battle of your fucking life, because this is the last time your hands can safely leave the keyboard until the fight is over.

Most of all, stay calm. Undyne the Undying and Sans are incredibly mean bosses. This is not like Jevil or Spamton Neo. You're going to be here for a very long time. But you will learn the patterns, you will get better, and you will beat them. If you start getting angry, take a break. If you start getting sloppy, take a break. They're not going anywhere. Try to be zen about attacks that are especially mean for you; just heal up and tank the damage. Every attempt is a learning experience, and every death brings you closer to victory. You just have to stay determined.

Happy genociding!