It's the 2nd of 3 dragon magic disciplines and is the other elemental variant, like breathrowing it relies on the spirit elementizing the mana that a drek consumes but unlike breathrowing you resist your gag reflex and instead distribute that mana throughout your body for various utilities that can range in extremity
But generally you are distributing the mana to essentially improve your physical abilities
Some examples might be a fire mage using fire magic to warm their blood, thus being able to resist the cold or skip sunbasking (the horror). An electric mage might channel their electricity through their hand to make it glow bright for seeing in the dark or overclock their nerves to help improve their reflexes. Wind mages might use their magic to shoot or propel themselves through the air with bursts of wind
And sometimes more combative things are done, such as an Acid mage channeling acidic mana through their teeth to melt those they bite, an ice mage growing a frigid frozen armor to protect themselves from dangerous or a fire mage lashing out waves of heat with a whip of the tail or a swing of the arm
So lots of utility and cool stuff you can do here, though granted its normally not the flashiest of magics as seen here with an "Electric Eyed Sarah"... normally you're using smaller doses of mana over longer periods of time
And it is far more dangerous than Breathrowing.
Taking small doses of mana is necessary as it is easy to induce mana sickness as, unlike breathrowing, you are expelling that mana which means you can easily turn yourself and/or your organs into puddles if you play it wrong just via mana exposure
Scalemorphing also requires a lot of discipline, focus, and concentration to do safely and to carefully control that magic flowing through your body. Failing to do so will unleash that force within your body in ways that your body probably won't survive. Electric mages giving themselves seizures or fire mages burning themselves from the inside out. With far more gruesome fates for ice, acid and wind that usually involve very unpleasant deaths
So due to this much higher threat of self injury or death, it is generally far less common to see scalemorphing mages and those that do scalemorphing tend to be more skilled mages (or more foolhardy ones). But the utility that one can gain through magic is it's own can of immensely useful utility for themselves and their community