Mastrum

A Mastrum is a massive magical storm caused by a influx of high essence materials into high winds and already occurring naturals disasters. They are easily identifiable by thier weird and seemingly random effects. They can fill tornados with fire throwing balls of firing out in all directions, turn hurricanes into showers of lightning and level cities by magically tearing up the ground. They are rare, but have seen an increase in events with magical resources being more actively mined in the world.
Mostrom's have becomes seminomas with the Thillalian lands and teh crownlands, as thier early exploration of magical resources lead to more of them being lifted into already common tornados and hurricanes, witch lead to more Mastrums. They are also well known in the north as the Giants and their Strom Harold's sometimes create them artificially as a ode to the gods of magic and storms. They even use them as a way to soften teh Defences of cities before a raid.
In the the more storm prone areas, essence driven industry has been greatly hindered due to these storms, as no state or magical institution has any sustainable way to deal with these extremally deadly storms. New investments have gone into better underground storage, and storm proof bunkers to help stop Mastrums from forming in teh first place, but these are relatively new methods of prevention, and have seen little testing.

Manifestation

The spawning of a Mastrum is rare and terrifying. They form shortly after teh disaster they are modify has formed and can lengthen the lifespan of a storm by hours or even days. They also become much more destructive with storms going from destroying a few buildings, to leveling a city.

Localization

They are most common near areas of high magical activity. With the industrialization of magical materials, they have been becoming increasingly common.

Type

Metaphysical, Arcane