You have five lives, use them well.

Within this modpack you'll find that you're immediately at a disadvantage. This is - and always will be - the case whenever you start a new run. You will die. While it's daylight now, you need to hurry, prepare. When night comes, you better hope that you have a light source to come in handy, whether that be the flame of a fire, or a torch. Even then, the light is only the first of your issues. The mobs are relentless, and creepers are the bane of your existence. Those walls wont hold forever. If you make it through the night, by some shred of luck, congratulations. Now do it all over again.

You'll need light; Make a campfire, make sure it stays lit, and has enough fuel. If not that, then find alternative means of acquiring light with the tools at your disposal.
You'll need food; Whether that be a handful of cooked seeds, crunchy bamboo, or even the flesh of the dead, you'll need it - constantly - if you want to make any meaningful progress.
You'll want weapons, and armor; Without it, you'll be quick to perish to the mobs of the night, and even more so to the ones that wake early in the morning.

(If you want a challenge, or some sort of direction, follow the list below, pick your poison, how badly do you want to suffer?)
MAIN ~~GOALS~~ NECESSITIES

I. Create a sustainable shelter.
II. A sustainable short-term source of light (excluding lava)
III. A sustainable source of (mostly) edible Food. The food type does not matter, hunting, or farming, etc.

I.Progress to the 'Iron Age'
II. Craft at last 3 Iron Ingots.

Survive ten days.
I. Congratulations. You've survived..! For now. Figure out how to survive for the true long-term. Try not to die!

Major Challenges
I. NOMAD: Every twenty days move a minimum of 20 chunks away from your current base, and create a new one.
II. BARBARIAN: Survive without ever wearing a single piece of armor.
III. IRON MAN: Enable hardcore mode: no second chances.
IV. PSYCHO: You are only allowed to wear Skeleton Armor, and can only eat raw foods, rotten flesh included. You may not cook food. The first tool of any tier that you craft MUST be a hoe, ex: you must craft an Iron Hoe before any other tool, etc. This extends to tinkers' construct. You may only craft short-bladed weapons, with the exception of Bone tools.

V. RELIGIOUSLY RANGING: You are not allowed to hit enemies with melee weapons.
VI. RELIGIOUSLY RAGING: Not to be confused with 'Ranging', you are not allowed to use any form of ranged weapons.
VII. FOOLISHLY FOOLHARDY: You may not make a shelter below ground, or over 6 blocks above the ground. You may not use traps of any kind. Every 2 nights (ex: Day 2, Day 4, Day 6), you must kill at least one mob.
VIII. SHOVEL KNIGHT: You may only use Shovels as weapons.

Life-Effecting Challenges
I. Veganism: You can't eat meat.
II. Veganism+: You can't directly kill ANYTHING that contains meat, including zombies.
III. Carnivore: Opposite of Veganism, you can only eat meat.
IV. Cannibal: You can only eat rotten flesh + its variants.
V. Cold-Blooded: You can't stand the cold, you are not allowed to make shelters in cold biomes.
VI. Eskimo: it's in your nature, you are only allowed to live in snowy biomes.
VII. Claustrophobic: Shelters you stay in for the night must be at least 4x4 with a 4 block high roof. You may not live underground.
Global Difficulties
Easy: Mobs do less damage, good for if you're trying to get a hang of the modpack.
Normal: Mobs do more damage, good for if you're getting the hang of things.
Hard: Mobs do the highest damage, you know what to do. Question is, can you survive the real challenge?

Sub-Challenges
I. Survive alone.
II. Face the night at least once, attempt to survive without walls, or a roof.
III. A happy crafter is a living crafter. Construct a fully furnished house that isn't below ground.
IV. Survive in an amplified world.
V. Surviving using the world seed: 7103153176129025923

Adapt or Die: This world wants you dead