Spoiler: The Mummy's Ancient Egyptian
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Through the mutterings and wails of the two mummies (now one), you've deciphered three main threads:

--General moaning and bewailing their lot, to be dragged from death back into a mockery of life and sent after the living;

--Foul curses at the "false gods" they've found themselves surrounded with (this seems to be the strongest theme); and

--muttered apologies to the living nearby for disturbing them with their presence... though this last one has dropped off considerably once the most recent mummy was set on fire.

It seems like the mummies are not here by their own will; they're being compelled by someone or something else to rise up and attack.