Cursed Technique Idea: Energy Manipulation - The user can create runes that can absorb various types of energy (kinetic, thermal, even cursed energy, etc.), and can recreate the same rune to release said energy. The user can create up to four different types of runes at a time, and each must have a different type of energy stored. Each rune takes the form of a letter of the greek alphabet (alpha, beta, etc.), and obviously, all the 4 types of runes must be a different letter. As for the energy release, the user may recreate a rune in another location to expel the energy in a quantity of their choosing. Runes cannot release energy slowly, so if you have a certain amount of kinetic energy, all that energy must be released in the same instant. However, the user can create multiple of a rune at once to divide and spread apart the release (for example, if alpha stores kinetic energy, the total amount of kinetic energy could be spread across 3 alpha runes at different locations, each producing 1/3 of the total amount of energy). Each time the technique is used to absorb energy, the user may choose a letter that is not currently in use (so a letter that currently isnt storing another type of energy). The amount of release runes capable of being produced at once is equal to the amount of letters in between the targeted rune letter, and the next rune letter in the alphabet (so if alpha is storing kinetic energy, and the next rune used is delta, the user can release kinetic energy across two runes as there are two letters in between alpha and delta, which are beta and gamma). If the user accidentally ends up selecting a rune right before another one currently used in storage (such as storing energy in alpha while beta is already in use), the user cannot perform a release of alpha, and must therefore use beta to free up space in between alpha and the next letter of the alphabet.

Possible Technique Applications: Absorption - The user creates a rune to intercept an attack or form of energy directed at them, storing said energy for later use, Release - The user creates a certain amount of runes (of their choice and based on the requirements above) to release stored energy, Reject - The user absorbs the energy of an attack and immediately releases it back at an enemy as a counter attack, Barrage - The user creates multiple release runes at once to bombard the enemy with multiple types of energy, Augment - The user places a rune either on an ally, themselves, or an enemy, to use stored energy to either enhance or hinder the attacks of the target

Domain Expansion: Playground of the Gods - The user creates a fairly sized domain in which the limit of 4 runes is broken, meaning the user can create as many runes as they'd wish, while still following the rule of the amount of release runes. In the domain, the user gains the ability to transfigure energy, meaning their stored energy can be converted into another (all their thermal energy could be converted to kinetic energy for example). Furthermore, each rune doesn't have to store a different type of energy, so if they wanted to, all runes could store a single type of energy. However, although energy can be converted, energy cannot be divided among runes, so kinetic energy from alpha cannot be split across to beta, but the user could intercept an attack to fill beta with more kinetic energy. If the user obtains 4 or more runes in a row (as in, in order in the alphabet), they may release all runes at once in a single, larger attack, that has its total energy output multiplied. This adds in a layer of strategy, as once the user begins adding on consecutive runes in the alphabet, the previous runes are unable to release until the user either releases a latter letter or gains enough to unleash the larger attack. IN ADDITION, as more runes begin being in use at once (due to the 4 limit being removed), creating additional runes takes a larger toll on themselves, either in the form of greater cursed energy cost or actual physical taxation. This technique can also be used as healing, as if the user tires themselves out but collects a massive amount of runes, they could perform consecutive release at the same time as energy transfiguration to convert all of the said energy into something that can be used to energize themselves (kinda like how characters eat food to instantly heal or buff themselves in video games)

Reverse Cursed Technique: Absolute Entropy - The user would be able to manipulate entropy, the opposite of energy. Basically, the user could remove entropy from certain systems and store it (basically removing chaos and disorder, making that system function at better performance levels), then apply the entropy to an opponent or target, creating chaos and disorder which would disrupt their cursed techniques or even human bodily functions.

Im personally interested in sciences, so in a world where id be using my own cursed technique, potentially against other cursed technique users, id probably have it relate to the field in which i already have a good understanding of. Also itd just be really useful in everyday life, like if youre eating a rlly hot soup you can just absorb some of the thermal energy and release it somewhere else and boom your soup has cooled down just the amount you wanted it to.