7 Odd Potions

1. Elemental Harmony Potion 

This is an entire class of potions, and includes the basic elements like fire, water,  earth,  and so forth. Each is a different color, and taste, but all have the same basic bonus.  Each grants an increase in affinity with its respective elements. This gives an increased resistance to damage from those elements. These potions are common and easily acquired, and while they grant damage resistance to their related elements, most have other effects that make them more valuable and profitable for non-adventurers.

Potion of Fire Harmony - this potion allows the consumer to remain comfortable in temperatures up to 120 degrees F without issue, and above that they might start sweating and consider a cool glass of water or a good hat.

Potion of Ice Harmony - as the fire potion, but the inverse. Anything above 20 degrees F is highly agreeable, once things drop below that its time for a nice sweater or a comfy jacket.

Potion of Water Harmony - almost no difficulty swimming, float like a cork, and even no longer bothered by water on the ear, or aspirating water.

Potion of Earth Harmony - a slab of rock makes for a comfy bed now.

2. Elemental Corruption Potion

Turns a living creature into an Elemental abomination version of their current race and class

3. Mutant Potion

All creatures and beings have a base type, be it humans and Normal, or dwarves as Stone, this silvery potion randomly changes the base type of the consumer, with according changes in base abilities, racial traits, and so forth. This isn't a potion to turn a human into a dwarf, it is a potion that might grant a human user the Insect base type, turning them into a chitin-covered remorseless being, or a dragon-type human with scales and gold rage issues. This is a popular potion, but highly erratic in its outcome.

Higher-level and purity versions of this potion can narrow the range of types it can cause, the duration, and the depth of the effect. Rumors exist of epic and legendary versions of this potion that turn those who drink them into permanent monstrous versions of themselves. 

4. Wretched Potion

Not all potions have beneficial results. The Wretched potion is an amber colored liquid with a buttery taste. When consumed, it temporarily cripples the consumer by reducing all of their functional stats by 50%. Higher grade potions can reduce it further, while weaker versions do less. Some adventurers have used it as a way to limit lethal risk in demonstration fights, or when facing rivals or in training scenarios when no one wants there to be any bodies bloody on the ground. More often it is used to keep powerful beings restrained and controllable, in kidnappings, and similar nefarious actions.

5. Shadow Potion

The Shadow Potion is a bitter black draught that comes in a sealed light-proof vial. When consumed, it makes the consumer much more difficult to see, especially in dark and shadowy locations. This is a function of the consumer becoming part living shadow, and allows them much greater ability to sneak. These are prized by nobles who wish to avoid attention, thieves for the obvious reason of having a bandolier of stealth potions, and assassins for making their getaway.

6. Gross Potion

An emerald green potion with a strange iron/chlorine taste, the Gross Potion is a dangerous potion to use. When consumed, the target will increase one size level, with an according increase in physical stats, with noticable increases in strength and stamina. Their health will also be restored to its new higher level. When the potion effects expire, the target will shrink as their body loses all the extra mass and size, and their health will decrease back to its original level. If their increased health allowed them to survive more damage than their original health and they let it wear off, they will have to make a body/stamina check to see if they survive, or if they simple collapse to the ground, dead.

Also known as the This isn't even my final form potion. Rumors say that there are epic and legendary potions that can increase base size two or even four steps, or some that have permanent effects.

7. Potion of the Astral Sea

Its just DMT