Terrain Bonus is an important concept in many games in the Fire Emblem series, it refers to the various effective stat increases received by standing on a particular type of Terrain. Typically in most Fire Emblem games terrain bonus decreases the hit chance, damage and magical damage of opponents attacking the occupant of the affected square, though under some circumstances it can add to the hit chance and damage of the square's occupant. This takes effect usually in the calculation of a character's Defense and Avoid.