The emergence of this new "Heroic Age (UR)" Card was very valuable to Leonard Ethan, as it significantly increased his chances and strength of using extraordinary powers.
For example, he had mastered alchemy, but most of the things could not be made because their ingredients were some fantastical materials that don't actually exist, conjured up in people's imaginations.
While theoretically ordinary items could replace those extraordinary ones, in practice, using ordinary items would either produce a subpar effect, no effect, or even cause adverse effects.
There's a simple example: several alchemical potions required the use of a Mandrake that looks like a human and can cry, make noise, and run.
Of course, it's possible to use the Mandrakes that do exist in reality instead, but the effect of the medication would be significantly worse. Leonard Ethan observed that those potions were complex to make, costly, and their efficacy was sometimes even less than that of common medicines.
