It's visualization wasn't difficult, and the effects of healing were moderate. But for Aiden, it was enough.
The reason he even redeemed this technique was just to use it as a cover-up for when he would use life liquid in public.
Even if someone could see some flaws with it, it would still be better than healing all the way back to full health with nothing to show for it.
…
A few hours later...
Aiden was in his dorm room and brought out a large cauldron from God-knows-where and started boiling water in it.
And it wasn't just water; Aiden could be seen adding other liquids and chemicals to this cauldron from time to time until the solution turned a bright, burning orange.
Just one glance at the bubbling, ominous surface could tell you that this was not a safe thing. But Aiden didn't care and was constantly looking back and forth between the large cauldron and a small manual in his hands to ensure he had gotten the ratio right.