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There are many easy ways to customize the NPCs in this appendix for your home campaign.
- Racial Traits. You can add racial traits to an NPC. For example, a halfling druid might have a speed of 25 and the Lucky trait. Adding racial traits to an NPC doesn't alter its challenge rating. For more on racial traits, see the Player's Handbook.
- Spell Swaps. One way to customize an NPC spellcaster is to replace one or more of its spells. You can substitute any spell on the NPC's spell list with a different spell of the same level from the same spell list. Swapping spells in this manner doesn't alter an NPC's challenge rating.
- Armor and Weapon Swaps. You can upgrade or downgrade an NPC's armor, or add or switch weapons. Adjustments to Armor Class and damage can change an NPC's challenge rating.
- Magic Items. The more powerful an NPC, the more likely it has one or more magic items in its possession. An archmage, for example, might have a magic staff or wand, as well as one or more potions and scrolls. Giving an NPC a potent damage-dealing magic item could alter its challenge rating.