Help me with sound effects!

[tacticslion]

So, I'm running a PbP (very poorly, I might add - I was doing well until our son was born early, alas, but after that I've been... erratic, despite my best efforts).

So anyway, we're at the climactic battle (as you do), and I wanted some great sound effects.

I have a great mystical language to use for dramatic effect. (It's Sanskrit, imitating a kind of celestial/sylvan/spirit-language in this game.)

I have a great dissonant soundtrack to play (though I'd appreciate finding a looped/extended non-"remixed" version). ((TV Trope Warning: however, it used to be called something other than "Soundtrack Dissonance" - like "Runaway Soundtrack" or something like that, but I can't find or recall the original name... anyone know?))

I even have a great, melodramatic bells to ring first!

... but I can't find a great earthquake noise.

Don't get me wrong. Collapse sounds (nope), Fall sounds (nope), low-rumble earthquake (great, but not enough on its own), earthquake 2 (also great), Earthquake Soundscape (unfortunately too many "modern" sounds), Cave Sounds and CAVE SOUNDS (going to use both... later), and similar exist, buuuuu~t, none of those are really close enough.

What I'm looking for is something kind of like this (WARNING: VAGRANT STORY MEGA-SPOILERS)... only less "fuzzy" and with none of the needless extra sound-effects.

The problem is that they're inside the cavern as it's collapsing (it's an enormous 110+ ft. tall cavern and an earthquake spell is targeting the center column at present), and the kind of low-key rumbles... just don't have everything needed. I wanted sounds like a few falling rocks or collapsing columns or something, and... my Google-fu is really weak, or they're really hard to find. Preferably something extended and/or semi-repitious (for multiple collapses and things).

So... help me, all, please! You're my only hope usually much better at finding things than me! Thanks!