impact potions

Mechanically, an impact potion works much the same way as a conventional potion. It stores a three success magical effect in liquid (or sometimes a powder), but instead of the target of the spell drinking the potion, someone chucks the grenade at the target.
Typically the potion is kept in glass or ceramic container that is ideally fragile enough to break on contact with a hard surface but durable enough not to break accidentally in storage.
Impact potions have several risks. First, accidental breakage as alluded to before. But also, someone could throw a potion and have it not break when they want it too. Or the thrower can simply miss. Most impact potions have a relatively small radius of effect so throws have to generally be pretty close to the target.
Impact potions can be created by divine or arcane casters, but they are relatively unpopular in most divine circles.
Regardless of type, impact potions use the same basic creation mechanism of regular potions but they cost 20% more in base material cost and some of this cost is because aerodynamic easily throwable containers are harder to make.
While almost any magical effect theoretically be turned into an impact potion, the most common impact potions either store dispel magic or an invocation burst.

Dispel Magic Grenade

by Me with Midjourney

A dispel magic impact potion typically only has a one yard diameter yield, but they can be made to a one yard radius at 20% greater base cost. A dispel magic impact will nullify any focused spell it touches, if the spell was with three successes or less. Otherwise, it does nothing.
Against a spread spell with multiple targets, a dispel magic impact will wipe out the magic completely but only on the targets the "blast" touches.

Impact potions made with Purification ●●● divine magic essentially do the exact same thing only they cost a lot more because it uses a base ●●● effect rather than base ●● though a Purification potions leave behind a more pleasant odor and can also kill germs and/or turn very weak undead.

Invocation Grenades

Invocation impact potions usually generate 5 dice of damage in a ten foot radius or 9 dice in a one foot radius, but the later are not especially accurate and the former are not especially damaging.
Even though invocation does not have normal levels in the sense of the other schools of magic, Invocation grenades are considered to be ●● effects for the purpose of calculating base cost and an invoker need to have at least two dots of invocation to be able to craft an invocation grenade.

by Me with Midjourney

One thing inventive adventurers and soldiers often using wide radius invocation grenades, not as a weapon per se but as a trigger mechanism for booby traps based around highly flammable materials. They are ideal for triggering piles of alchemist's fire.

by Me with Midjourney

That is assuming the invocation effect is based on fire. An invocation can be filled with cold energy. This raises the base cost another 10%, but cold impact potions make handy magical fire suppressors.
They also work as a battlefield weapon for warriors who want to avoid collateral fires (though for many adventurers collateral fires are a feature, not a bug)

Hex Grenades?

Yes, they are pretty easy to construct. The problem is that almost all hexes are resisted by Willpower and since all potions are capped at three success effects, this means a Hex grenade will only curse someone who is weak willed and/or unlucky, and that is assuming the thrower doesn't miss with the grenade.
Many Scarterran theurgists and mages believed that Hex Grenades are inherently unlucky. A hex potion is essentially the metaphysical essence of bad luck magically stored in a fragile glass container. Anyone carrying this around long-term is asking for trouble.
Such potions are known to be prone to accidental breaking or not breaking when the thrower wants them to. The longer a Hex grenade is unexploded, the more likely the owner is to suffer accidents or bad luck with it.

Healing Grenade Loophole?

Healing potions are normally drank, and they heal three health levels to the person drinking.
An inventive power gamer might come up with the idea to use a healing grenade and splash two allies at once, healing six health levels with one potion.
No, a healing grenade that splashes two people will heal both subjects one health level, maybe two if one target gets the lion share of the liquid splashed on them. A very lucky and even hit may let three targets heal one health level each but more than this is impossible and less than this is likely.
That said, a healing grenade can be useful, if unorthodox weapon against undead, so they are not pure purple chickens, but they are not popular.