Stat adjustment items: Items that adjust Stats (strength, int, etc) work a little differently than listed in the book; they add to your base ability instead of replacing it but the max is also increased by 1. For example, Gauntlets of Ogre Power add +2 to your strength (max 20), they don't change it to 19. Any item that have a maximum score of 20 or less do not require attunement. Items that can increase above 20 still require attunement. See
Purchasing Costs for details.
Death and Dying: There is a cost to dying in my world. Most NPCs can't be raised from the dead. This is a world where even gods can die. When people die, there is a very short timeframe when their soul is traveling through Nifleheim. Once in their final destination (whether Valhalla, Helheim or other) they cannot return. If a PC dies and is raised, there will probably be consequences that have to be dealt with. Exact details will be dealt with in-game (although perhaps not in the same game session the PC is raised in) and won't be meta-game penalties but repercussions that have to be dealt with by the PCs.
Paladin Mounts: As written, paladin mounts are useful when you first get them but die quickly at higher levels. To give them a bit more durability, they gain HD equal to the PC's level. In addition, their proficiency bonus (and therefore chance to hit) increases at the same rate as the PC.
Other minor changes
- Bag of Holding: require an action to retrieve an item.
- Bows: you can use either strength or dex, they are finesse weapons.
- Potions: drinking a potion is a bonus action.
- Purchasing magic items: there is a base price list, but magic is sold through brokers and items may or may not be available. Check first, actual cost may vary.
- Heward's Handy Haversack: retrieve items as normal.
- Teleportation Circle: You do not automatically know any sigils, sigil patterns are a closely guarded secret.
- Teleportation: Several places have guards against teleportation beyond just the normal chance of failure. Use at your own risk.
- Thrown weapons: you can draw them for free and throw multiple every turn. I assume you have either a bandolier or quiver of some sort to hold them.