I'm still posting a short piece of TTRPG writing inspired by a random Magic card once a week! This week's card is Fire Whip.
Fire Whip
A magic weapon. Stats like a +1 whip that deals fire damage. This weapon has one charge, which you can spend to make an additional attack in a turn with double the range. When the charge is expended, all magic in the item is inert and it just works like a completely ordinary whip. Some ways you could replenish its charge include leaving it at the heart of a bonfire until all the wood has turned to embers, or get attacked by a dragon's breath or a fire elemental while holding it.
Additional Notes
What makes a magic item a GLOG magic item? It's a tough question, which is why I made the prompt for MTGLOG MONDAYS say TTRPG writing and not GLOG writing.
Well, if it interacts with a GLOG-specific mechanic like spell dice, that's one thing. But otherwise, for me, the GLOG is all about hacking together your favorite pieces of other systems, so GLOG-specific content should aim for some level of system neutrality (or at least neutrality among OSR and d20 style systems) to make the hacking easier.
I also like using diegetic effects where it makes sense - I could have just made the Fire Whip's charge return on a long rest, but a bonfire is a something that would often be present at a long rest anyways, and it adds more flavor while introducing some potential for creative use of the item's properties. Besides, not every GLOGhack will use the short rest/long rest distinction! (System neutrality again!)
Also, yes, you could theoretically use the Fire Whip's second attack every round while fighting certain enemies! Those enemies are likely to be resistant or even outright immune to fire damage though, so maybe you want your whip to stay inert so it just deals mundane damage against them.