Flood Plain Ruin gate with red spear

[evanlpearse27]

just finished flooded ruin and cant seem to find how you open gate with skeleton next to red spear (room next to 4 picture puzzle), if its something i come back to later thats all i need to know.

Edit: nevermind found it, for anyone else with same problem go left into spider caves till you hit waterfall, that path will take you where you need to go:)