The word fallecerá is the future form of fallecer in the third person singular.
See the full fallecer conjugation

fallecer

Mis maneras fallecerán, mi posteridad fallecerá - incluso la tierra y todos los criaderos de la humanidad fallecerán. Para, el espacio para llevar a cabo toda la manera de la vida es muy ancho, y el tiempo es muy largo.
My ways will perish, my posterity will perish - even the Earth and all the breeding places of mankind will perish. For, the space to hold all manner of life is very wide, and time is very long.
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