#the angst... yearning... fluff...

what resonance perception is: an analytical type of magic ability that identifies, analyses, and recalls pattern recognitions and structural interpretations in magic flows and spells. hajun anchors the active usage of this ability through "spellcasting" (or what he specialises in: essolinguistic casting). additionally, resonance perception supports passive + active usage.

what it isn't: does not increase magic power or innate magic perception. it enhances how perceived information is processed and understood. limits: cannot read thoughts, know unknown magic instantly on the spot, perfectly analyse a caster's magic without prior exposure, bypass any magic complexity without effort or study.

passive usage this state is intuitively and automatically always on, low-level, non-intrusive; may sometimes require low-level one-word or 1-phrase spells depending on context/uses; prone to leakage if not properly trained or constantly controlled.

sense and mentally store other caster's flow signatures (memory + pattern recognition of a magic flow's characteristics, a witch's casting tendencies and timing habits).

notice magic instabilities or timing irregularities especially to spell works ("this feels like XYZ person's casting" or, "that caster's flow is unstable")

being familiar with other witches' flow signatures require prior exposure and repetition. hajun cannot predict what other witches' magic will do or instantly master any unknown/complex magic.

in day-to-day life, as hajun's ability constantly and continuously reads micro-variations in magic flow and structure since he first manifested and also considering that his resonance perception is aligned with the nature's principle of "order", his movements, timing, manner of physically interacting with his environment, and his presence are always slightly more precise than normal.

therefore, things around him may appear more stable because his magic ability reduces error before they become full instabilities through precise interactions. in daily interactions, people may have the perception that things just "work" easier around him.

what it isn't: not passive casting (depending on context, hajun still has to use low-level casting or one-word spells to define subject, scope, duration, action); no permanent environmental or object manipulations; not reality manipulation. examples of what this feels like in hajun's daily routines and may even be felt by other witches/familiars: ambient noise suppression (within hajun's defined scope/duration); less chances of things spilling or breaking in his presence; consistent room temperature control; less chances for people to trip over in his presence or for him to twist an ankle while walking; dust do not settle on his clothes at all; books neatly stacked regardless of him throwing something recklessly on top of it. limits: these effects only apply through his presence and direct/indirect interactions & does not persist after he leaves a room or area. it does not extend beyond these factors, nor override other witches/familiar's magic. hajun also needs to release low-level casted spells if used before leaving his surroundings. risks: hajun's ability may unconsciously risk "over-stabilisation" ── which may come across as a feeling that is unnerving or uncomfortable for people, like something is being held in place and everything is too unnaturally clean, tense, perfect, too controlled or slightly forced. conversations end too quickly, someone's grip over their mug tightens too early, most animals especially cats find him or his presence uncanny because nature is supposed to be wild, chaotic, unpredictable and everything that he is not; subtle things like that. over-stabilisation is usually caused by stress, hyper concentration, or emotional instability.

active usage in this state, resonance perception gives him the information about magic flow and spell structures; and spellcasting helps him determine the outcome/response against another caster's magic.

requires: focus, exposure to a specific magic or spell, available cognitive bandwidth, controlled emotional stability. limits: hajun cannot instantly understand unknown or complex magic without prior exposure; do not guarantee correct interpretation; act without ample processing time; bypass skill gap or magic level that is higher than his. under extreme pressure/risks: too many inputs and he's overloaded, therefore the analysis slows or breaks. his spells also might misfire or cause temporary environmental distortions. in severe cases, physical follows psychological and cognitive states, so if overpowered constantly and consistently, hajun's exhaustion and drain catches up for collapse/blackout/vulnerability.

as an individual caster, hajun is great at reading incoming magic, identifying and analysing its weak points and timing gaps, then responding or editing his spells to match the other caster's output in the moment. he excels in disrupting unstable spells, redirecting or reducing magic impacts, exploiting timing errors, and influencing the other party's magic into inefficiency. overall, his ability is considered more as a single - target control / precision casting rather than DPS or AOE. additionally, he is a close melee combatant and probably have yet to master or think about long - range defense / offense tactics.