I have thousands of open doors, yet I hold captives tight, I dance within the ocean's depths without a beam of light. I am woven out of simple strands, invisible to prey, And swallow up a silver swarm before I'm pulled away.

High beams?

This companion to counterpane Might be concealed by cushion or wall It’s often sought out when energy wanes Though some are content to rest where they fall

My first three are a specter's cry when haunting Halloween My last two are just fine, alright, or average, even mean Together, I'm a portal to world that's never seen

I am small. I glow and smolder. I am the incandescence after fiery dance.