Coffer hunting in Eldieme Necropolis.Follow

So there I stood... outside this foul wretched place, taking a breath and strengthening my resolve I stepped inside and began to move forward... but there ahead of me were several Lost Souls. Chuckling softly I took a pot of silent oil and poured it on myself before running past them and in to the Necropolis. I continued moving down the stairs to locate the bones of a wretched Hume for near him I would find the treasure that I sought... so I moved to it but my way was blocked... the foul titan's gate loomed before me... so I began searching for a way... any way to open it... all for naught... the undead are chasing me now... they are getting closer... the light... no! A dead end! So I drew my scythe and faced them only to be slain where I stood by the shadows that were once my brother Elvaan...
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Anyway, enough in character, time for some out of character, namely, how do I open Titan's gate to get downstairs to the Hume bones? I need to get to the two coffer spawning points that are nearby since those are the only two I know. Unless someone knows the other spawn points?

And don't forget bombs agro on sight.