Originally posted by Questionable:

I killed the elder, put the trophy on the hook... still he won't get checked off.

When I find locator pts, they keep locating Elder still.

I summoned him again and killed him again. Can't hang the trophy again cause its already done.

Am I missing something?

Are the locators that you are using in the Swamp? If not they won't help you find the 3rd boss.