{Substitution.}
One of the unique abilities that Legendary Hunters possess, and a key factor in placing Hunters at the top among standard classes.
This skill allows the user to freely swap any two items within their line of sight, provided a simple condition is met: Either the weights of the two items must be equal, or their mana content must match.
By equal, it doesn't mean the weight has to be precise; it can vary slightly.
For example…
Ivor easily chopped down a massive tree using one of his axes, then divided it into several sections.
After signing a mana contract, he gained the ability to estimate length and weight just by looking at objects, along with some other abilities.
He then threw two large pieces of wood down and made sure to reinforce them with some mana. Then it was time for the skill.
Ivor swapped himself and Jin with the logs and did the same for me with a random stone.