First of the Second Issue Theme Riddles

By Sarah Little

To further celebrate our inaugural issue the editors of Cauldron Anthology will be posting poems, essays and flash fiction to celebrate the theme of Siren.  We will be posting every Saturday, alternating between Siren themed works, and riddles for our upcoming second issue. Today we have our first riddle. See if you can guess the theme for Issue 2!  

I am a protector, a guardian
of a liminal state.
If you meet me, you
have a toll to pay.
Most cannot afford to pay,
but perhaps you can.
If you cannot, you may not
leave me.
Who am I?