[Changes and additions]
Implemented the effects of 2 items that allow you to spawn NPC children.
This is a completely separate feature from making a gene and incarnating an adventurer from it.
There are no restrictions on who the parents of a child can be, and it also allows you to spawn twins, triplets, or even septuplets and octuplets if you want.

That said, child-rearing is a lot of trouble so I don't recommend having too many children at once if it's your first time trying out this feature.
Added 1 new NPC. It's not actually entirely new - it was already in the code in previous versions.
The journal now displays the danger level of main and sub quests so that people can better judge their difficulty.
Transportation deeds no longer disappear after use. This allows players to own several different kinds and swap between them.
Amount taxed will depend on the most expensive vehicle used during the month.
Added 3 new special actions.
There was a "coldproof" attribute that prevented items with it from shattering from cold, already implemented in the code. However, it was never applied to anything.

That attribute is now intrinsic to bamboo, wood, cloth, silk, paper, leather, zylon, spirit cloth, dawn cloth, and griffon scale.
There are 15 fireproof and 7 acidproof materials, so I've picked 10 materials that seemed most likely to be shatter-proof due to their elasticity or poor heat conductivity.

Existing items generated in previous versions of the game can gain this attribute when their material is rerolled.
Increased the amount of resistances conferred by eating items such as corpses and yith-yaki. Resistance gain caps out at the "Little" rank.
It's also tedious to keep track of who has eaten how many of which corpse, so eating just 1 item will now confer enough resistance to reach the cap.
However, in order to preserve racial characteristics, characters whose race is "Criticaly Weak" (sic) against that element cannot gain resistances in this manner.

Increased experience multipliers when defeating enemies above the player character's (PC) level so as to help the PC level match the level of enemies.
The following were the experience multipliers when defeating monsters of a certain level in previous versions: