No Griefing is a minimal, surgical tweak to two mobs — nothing else in vanilla Minecraft is touched.
Creepers can no longer sense you and detonate on their own. The classic "walked around a corner and lost my base" moment is gone. They'll still chase you down and melee attack like a zombie, so they're not harmless — they just can't blow up your builds by proximity anymore. Flint-and-steel ignition still works exactly as vanilla, so lightning-charged creepers can still be safely detonated on purpose to farm mob heads.
Endermen can no longer pick up blocks from the world or place them back down. Teleporting, aggroing when you look at them, and melee attacking are all fully intact — they're just no longer able to rearrange your terrain or leave floating dirt blocks scattered around your base.
Everything else about both mobs — health, drops, spawn behavior, movement, sounds, targeting — is 100% vanilla. This pack only removes the specific behaviors responsible for griefing, making it ideal for Hardcore or long-term survival worlds where you don't want to babysit your builds against creeper and enderman damage.

