Giant Spider

A Giant Spider appears! You attempt to flee! Giant Spider attacks for massive damage!!
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It seems that this is from LIMBO.

I laughed so hard when I first saw this text. It's a reference to about every Japanese RPG ever made.

I thought it sounded like it was from Zork or Advent or something.

Could be. In any case, it was quite hilarious.

I don't think it's from Zork or Advent, those ones didn't have very good combat systems. My guess would be Nethack or the like.