Mature steam, first gasoline, the cusp of electricity - a curated Create 6 survival era-pack: rail empires, oil fields, physics airships, industrialized enchanting, and ruins worth an expedition.
The Welcome to the Underworld quest no longer shows a JSON error in the quest book when it unlocks (its gold-armor objectives were missing equipment-slot data).
Tweaks
Death rebalance: your body now turns to a skeleton after 10 minutes, and picked-clean bones fade after 30 minutes. Corpses holding items still never despawn - your stuff always waits (lava remains the only thing that destroys a body).