u/iplexed

Base Technique: Cursed Star Creation (CSC) allows the user to create “Cursed Stars” by compressing cursed energy into extremely dense, hot orbs. These stars even have their own gravitational pull and are similar (though obviously much weaker than) a real star. While these stars can act as passive battlefield hazards, threatening to burn and crush enemies who get too close to them, they can also explode like a supernova. The size of this explosion can be controlled to prioritize range or potency. 
Though CSC is powerful, it also necessitates either careful planning or insane levels of output. The formation of a cursed star is primarily dependent on the sorcerer’s output (among other things, like concentration and general CE manipulation skill). It takes most average sorcerers about 5-8 seconds to create a stable cursed star capable of seriously injuring an opponent relative to them. Though the creation process can be paused (so you can create a CS for 4 seconds and then add to it more later, for example), this risks the star collapsing prematurely if CE control or concentration is heavily compromised. However, most fully formed Cursed Stars are relatively stable and can sit passively for days or even weeks. 
Cursed Stars can be moved at moderate speeds, though they can be dodged handily by sorcerers relative to the user if they know they are coming (which isn’t too difficult due to the star’s strong CE signature). 
Applications: CSC is relatively simple and thus lacks extension techniques, but it does have some nifty applications. 

• Attack Absorption: This technique can condense and create Cursed Stars from any external cursed energy (not internal, since that violates the Innate Domain rule). This means the user can create cursed stars and supplement them with residual CE, externalized CE (Whether pure CE blasts or ranged technique effects like Sukuna’s Dismantle), or even weaker cursed tools. Skilled users can even create Cursed Stars that integrate the effects of the cursed technique phenomenon they absorb. 
• Combining: When two or more cursed stars are close enough, they will begin to rapidly orbit around and then crash into each other, resulting in a much larger supernova explosion than either could have produced by themselves. The user can also choose to have them simply combine into a larger cursed star, but then requires immense skill with CE manipulation and is usually not worth the effort. 
• Code Switching: The user can use binding vows to alter the exact potency of the various aspects of Cursed Stars, increasing the heat, gravitational pull, speed, or explosive potency in exchange for a reduction in another aspect, a higher CE requirement for creation/maintenance, handsigns/chants, etc. Extremely skilled users could even have multiple “profiles” of cursed stars they could create, switching between creating larger stars for damaging their opponent and smaller stars that use their explosiveness to propel the user around the battlefield very quickly.

Cursed Technique Reversal: I’ve created 2 different reversals for CSC, and I’m not entirely sure which is better. Feel free to leave your opinion in the comments on which technique you think would be better. 

• Reversal 1: Instead of condensing CE to create Cursed Stars, the user condenses positive energy to create Reversed Moons. These moons heal any living organisms within a small radius of them with positive energy. The user can make a Reversed Moon explode, releasing a large burst of positive energy that can fully heal organisms from a near-death state incredibly quickly. The main benefit of this reversal is that Reversed Moons, although requiring positive energy for their initial creation, can subsist on normal cursed energy, making them a more efficient way to use RCT. Of course, this comes with the trade-off of having much less control over what you heal. 
• Reversal 2: Instead of condensing external CE to create Cursed Stars, the user causes internal CE to expand outwards. In practice, this means the user can output extremely large amounts of raw CE from their body, similar to Ryu, and surpass their own output limitations at the cost of a large loss of CE. This CTR can also be used on opponents via physical contact to quickly drain their CE, though it holds great risk for the user.

Domain Expansion: This domain creates an environment of a grassy hillside overlooking an expansive starry night sky. Though if you look closer, you’ll see that they are not actually stars but ever-growing Cursed Stars that the user can, at any time, choose to detonate, causing immense damage to anyone within the domain and immediately collapsing it. 
The sure-hit of the domain drains cursed energy from the target and condenses it to either feed the incredibly large Cursed Stars looming above or to create new ones closer to the ground. Cursed Stars are also much easier to create within the domain, requiring less concentration from the caster’s end. 

Assuming the wielder has the sufficient skill to use RCT and run it through their technique, of course.

Bonus question, if you believe some techniques don't have reversals, what do you think would happen if somebody ran RCE through them anyways? Would it just execute the normal technique effect? Do nothing at all? Something else?

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