Unyielding

• Randomly generated structures with a wide variety of loot:
  Chocolate Quest Repoured Ancient Warfare 2: Tweaked Recurrent Complex
  (Unofficial) Bosses of Mass Destruction + Dungeon Additions
• Grimoire of Gaia
• Lycanites Mobs
• Mo' Creatures Extended
• Touhou Little Maid
• Scape and Run: Parasites
• Scape and Run: Monstress
• Scape and Run: Revenants
• Parkour thanks to Elenai Dodge 2 + Wall-Jump!
• An extensive abilities system from Ender Skills
• Class system from Menhir
• Electroblob's Wizardry and Ancient Spellcraft
• Over 100 new high quality enchantments courtesy of Unique Enchantments
• The ability to permanently increase your maximum HP through various means
• Progressive Core Unofficial
• Look for the manuals scattered around to learn more and better technology
• Magneticraft
• Many of the weapons found in Techguns have been buffed
• Later on get access to Ender IO, NuclearCraft: Overhauled and QMD.
• A new immersive and also more effective way to chop whole trees with ease - HT's TreeChop
• Additional bauble slots for many of the baubles added - Bring Me The Rings! BountifulBaubles Extra Alchemy Random Things Trinkets and Baubles
• No more lava bucketing everything without risk, get some tongs or mitts before doing so
• Collision damage is active at all times, don't mindlessly zoom through everything
• Realistic Item physics
• Corail Tombstone
• Debug info has been disabled, grab a compass if you want to have the coordinates on screen
       And get an Antique Atlas if you want both the coordinates and a minimap on screen
• Most mobs have been buffed, including SRP ones.
• A lot of mob infighting
  
• Custom music! Music Triggers

Note:
The included server.properties file already does this.

For a quick server installation, copy and paste this into your server.properties file on the
defaultworldgenerator-port=
line:
2cc474a1-fd8a-11ed-9dc2-e0d55ee7e3cb

-XX:+UseG1GC -Dsun.rmi.dgc.server.gcInterval=600000 -XX:+UnlockExperimentalVMOptions -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M -XX:+DisableExplicitGC -XX:+AlwaysPreTouch

-XX:+AggressiveOpts -XX:+UnlockExperimentalVMOptions -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSConcurrentMTEnabled -XX:+ExplicitGCInvokesConcurrent -XX:ParallelGCThreads=2 -XX:+OptimizeStringConcat -XX:+UseStringDeduplication -XX:+UseFastAccessorMethods -XX:+DisableExplicitGC -XX:MaxGCPauseMillis=10 -XX:GCPauseIntervalMillis=50 -XX:NewSize=84m -XX:+UseAdaptiveGCBoundary -XX:NewRatio=3 -Dfml.readTimeout=90

With the help of Music Triggers

Roalty Free tracks from:

suonho
https://freesound.org/people/suonho/

yewbic
https://freesound.org/people/yewbic/

klankbeeld
https://freesound.org/people/klankbeeld/

Trebblofang
https://freesound.org/people/Trebblofang/

PatrickLieberkind
https://freesound.org/people/PatrickLieberkind/

TheDweebMan
https://freesound.org/people/TheDweebMan/

Pixelated v1.3 EnhancedVisuals
nox_cgt
https://www.curseforge.com/minecraft/mc-mods/enhancedvisuals

Ice and Fire Mod, Resource Packs:

javaraptor
https://www.curseforge.com/minecraft/texture-packs/ice-and-fire-mod-resource-packs
Attribution: Public Domain (This work is dedicated to the public domain.)

Structures:

Benji's Adventure Pack I - By Benji

Village Building Pack and others by 0xebjc

https://complex.ivorius.de/

rn999 for 3 CQR structures

Fpiece for 2 CQR structures

Raziel for 1 structure

Dodo for 1 structure

More tracks:
Kevin MacLeod (incompetech.com)

No changes have been made to any of the tracks used.

do/portal_spread.zs by krutoy242

Shaders used in the screenshots: Builder's QOL