Investigation
Skill · Intelligence
Rules
When you look around for clues and make deductions based on those clues, you make an Intelligence (Investigation) check. You might deduce the location of a hidden object, discern from the appearance of a wound what kind of weapon dealt it, or determine the weakest point in a tunnel that could cause it to collapse. Poring through ancient scrolls in search of a hidden fragment of knowledge might also call for an Intelligence (Investigation) check.
Using Investigation
Investigation (Intelligence)
A Investigation check normally uses Intelligence . The Dungeon Master may call for a different ability when the situation justifies it.
The Tomato-Based Explanation
Investigation is looking closer to see that the tomato farmer is missing one element for his spell: a horse's tail.