As an action, you can create a vial of liquid with fur suspended in it. A creature can drink the contents as an action to alter their physical form to gain different characteristics. When you use this ability, you have 1 catalyst to choose one or more of the following effects. Each effect has its own catalyst cost, reducing the pool of catalysts.
Amphibious (1 catalyst). You gain gills; you can breathe air and water.
Bear’s Endurance (1 catalyst). You have advantage on constitution checks and gain 3d6 temporary health, which is lost when the spell ends.
Bull’s Strength (1 catalyst). You have advantage on strength checks, and your carrying capacity doubles.
Cat’s Grace (1 catalyst). You have advantage on dexterity checks and you don’t take damage from falling 6 meters or less if you aren’t incapacitated.
Climbing (1 catalyst). You grow tiny hooked claws that give you gain a climbing speed equal to your walking speed.
Camouflage (1 catalyst). Your skin and equipment take on the color and texture of nearby objects, including floors and walls, masking you from detection. For the duration, you have advantage on Stealth checks.
Echolocation (3 catalysts). You gain the ability to sense your surroundings by sound. For the duration, you have advantage on Perception checks that rely on hearing and have blindsight out to a range of 9 meters. If you already have blindsight, its range increases by 9 meters. You can’t use this blindsight while deafened.
Keen Senses (1 catalyst). Your eyes, ears, or nose become more sensitive. You gain advantage on Perception checks.
Natural Weapons (1 catalyst). You grow claws, fangs, spines, horns, or a different natural weapon of your choice. Your unarmed strikes deal 1d6 bludgeoning, piercing, or slashing damage, as appropriate to the natural weapon you chose. Your unarmed strikes also becomes magical, if they aren’t already.
Nocturnal (2 catalysts). Your eyes become accustomed to the dark. You have darkvision out to a range of 18 meters.
Swimming (1 catalyst). You gain fins and webbing between your fingers and toes; you gain a swimming speed equal to your walking speed.
Spider Climb (1 catalyst). If you have a climbing speed, you gain the ability to move up, down, and across vertical surfaces and upside down along ceilings, while leaving your hands free.
Tough Hide (1 catalyst, lasts 4 hours/catalyst). Your skin becomes as tough as leather; Your Defense becomes 13 + your Dexterity (max 4).
You can increase the pool of catalysts by 1 for each additional catalyst expended.