I found it a real pain in the butt to try to get anything done with all the abilities residing in one file, so I broke down CoreAbilities.xml into several different files for easier and quicker editing (for me at least).

CoreAbilities_ChampionHistory.xml
CoreAbilities_ChampionTalent.xml
CoreAbilities_ChampionWeakness.xml
CoreAbilities_CityUnlock.xml
CoreAbilities_Combat.xml
CoreAbilities_Injuries.xml
CoreAbilities_Player.xml
CoreAbilities_PlayerWeakness.xml
CoreAbilities_RaceBlood.xml
CoreAbilities_Spellbook.xml
CoreAbilities_Trophy.xml
CoreAbilities_Units.xml
CoreAbilities_Weakness.xml