The wailing and shrieking substances aren't very rare. Just have to be killing the right mobs, which means manipulating the War to get either the owlbears or the wolves to take over the southern islands in Hollowshade. Only the wolves/owlbears on the islands and the southern shore drop the substances. Alternatively, you can get the shrieking substances in Tenebrous, and the wailing substances in Paludal, but they are much more easier to get in quantity off the southern islands in Hollowshade.
I don't know what guide you found, but here are some links for more info on the Hollowshade war.
http://mboards.eqtraders.com/eq/showthread.php?t=6983
http://everquest.allakhazam.com/db/zone.html?zstrat=132
I don't know what guide you found, but here are some links for more info on the Hollowshade war.
http://mboards.eqtraders.com/eq/showthread.php?t=6983
http://everquest.allakhazam.com/db/zone.html?zstrat=132
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