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Mod Name : Nether Essence
Link to Mod: http://www.minecraftforum.net/topic/1890111-164-nether-essence-mod-v103/
Version : v1.0.3 for MC 1.6.4
Reason(s): On the topic of niche mods, this one squeezes in a not too overpowered, but still a nice way of another way of using Netherrack...