Your psicrystal is just able to detect -something- hiding in the tall grass. *50 feet ahead, 5 degrees to your left.* The crystal chimes. With the aid from your crystal, you are able to make out a feature lurking, waiting. It doesn't seem to know that you've spotted it yet, but you can't be quite sure what it even is yet.

Spoiler: OOC
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If you want to attack, roll initiative.