Artificer's Lore is a passive feature available to Rock Gnomes. They add twice their Proficiency Bonus to History checks.
Description
Add twice your 
to 
checks.
How to learn
Races:
- Character level 1: Rock Gnome
(Character level is the sum of all class levels for a multi-classed character.)
Used by creatures:
Notes
- Although not explicitly stated, this is equivalent to having expertise in History checks and will not stack with proficiency or other sources of expertise.