This is a list of submissions that I find different, odd, strange and fantastic.
The Poison Eaters Tribe dwells deep in the jungle glades of the Ushaika, in the lowest reaches of the undergrowth where no sunlight pierces through the leaves, and where the marshy ground wells up with tea-colored water at the lightest step.
Send in the clowns.
Your adventurers can name this one, if they survive. The last thing they will hear is: “ppppooockt-t-t-t-t-t-t-t-t-t” before their eyes and ears start bleeding and their body become black and blue… battered by something unseen and untouched.
Some parallel worlds have different time-flows, like the fabled dwelling-places of the elves: those who visit them under the hill for a night return to find that years have passed in this world. Perhaps it is the gate leading between the worlds which causes the alteration. If a gate were 'misaligned', the shift from '| |' to '| \' or '| /' as it were would lead to that difference, much as a light-beam split and bent by a prism ends up taking a longer path. There might even be a mathematical function linking degree of misalignment to alteration of time-rate.