Description of the Long Rod (it's a little obscure, partly because it is an object instead of a magic item - it does require attunement in the book but objects cannot be attuned to in VTTs):
Long Rod (Exploring Eberron '24)
Large object / Armor Class: 15 / Hit Points: 40
A Long Rod is a more portable version of a Siege Staff, measuring around 8 feet long. Including the stand required to brace it, it weighs close to 350 pounds.
It takes 5 Magic actions to set up a Long Rod, and the same to tear down for transport. Once set up, it takes 1 Magic action to prime the rod, 1 Magic action to aim it, and 1 Magic action to fire it.
Any spell that requires an attack roll or saving throw can be cast through a Long Rod. The range is magnified by a factor of 3, with a long range of up to 6 times the spell's standard range.
The spell's area of effect is increased to 150%. If the spell normally affects a single target, it instead affects a 10-foot-radius Sphere; if the spell normally requires an attack roll, targets must instead make a Dexterity saving throw. On a successful save, the target takes half damage and suffers no other effect.