What do I do at the tree?

Hint 1 of 6:

Is there anything unusual about this tree?

Hint 2 of 6:

Look at the tree's trunk.  Does it have a dent?

Hint 3 of 6:

Maybe you could find something to put in the dent.

Hint 4 of 6:

Can you find something that is the same shape?

Hint 5 of 6:

There is a pool of tears 1 screen south and 4 east of the temple.