I'm currently translating some song lyrics for my own understanding (境界線 by
Amazarashi) - I had some confusion on the following line:

> 境界線の向こう側で 忘れ去られ  
>  終わる定め そう知りながら  
>  屈服することを 許さぬあの声は  
>  かつての戦友か 己の心か

Per [online translation](https://lyricstranslate.com/en/ky%C5%8Dkaisen-
border.html), it means "Beyond the border, I can forget my ending fate. I
understand. The voice that doesn't allow you to give in, is it from your
former comrades or is it from your own heart?"

It seems to me that 忘れ去る here is in the passive form, 忘れ去られる, but the る is
dropped. Does anyone understand why this is / under what conditions you can
drop the る? It's also possible I'm misunderstanding the grammar, as I'm pretty
new to studying Japanese, so please let me know if this is the incorrect
interpretation. Thanks!
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2023-04-22T15:42:11.893
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2023-04-23T11:12:38.423
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question
grammar song-lyrics passive-voice renyōkei
る dropped from passive form?