At the end of battles, some item is obtained through Gladiolus personal’s survival skill. It is in addition to normal monster drops. They can be anything from basic consumable items such as potions to elixirs and even ores that could be sold at a high price. The higher tier of Gladiolus survival skill provides better quality item at the end of fights, no matter what the outcome is.
The survivalist Gladiolus skill can be leveled up through walking. The more you travel on foot, the more experience Gladiolus acquires at the end of the day. Because of this, it is important to travel around by walking as much as possible since the very beginning of the game. You should use Regalia or a fast travel only when it is necessary.