Ртуть - не любая эссенция, ртуть это ртуть. Получается золото - тоже не любая эссенция, максимум - ртуть.

в коробке ещё два "запасных"

8. При взятии куба для увеличения его потенциала можно потратить только один жетон Эфирного куба за раз.
9. В коробке 18 кубов, но для игры необходимо 16 кубов (6 черных, 5 белых и 5 красных).

Character Abilities:
01. Benefit: When drafting a die, you may spend 2 Ethereal Die tokens instead of just 1.
02. Benefit: You may spend 2 Ethereal Die tokens in place of a Chameleon token.
03. Start of Game: You start the game with 1 Chameleon token.
End of Game: At the end of the game, this card grants one element symbol of your choice.
04. Benefit: As a single action, you may spend 1 Potency to transmute a material two steps. The first Transmutation arrow must match the color of your die and you must spend 1 essence as normal. [When] performing a double transmutation, you may not activate any Artifacts.
05. Benefit: The cost for you to unlock Formulas with Gold is decreased by 1 for the third and fourth Formulas (1/2/2/3 instead of 1/2/3/4).
06. Benefit: As a single reaction, you may gain both a material and essence.
07. Benefit: When acquiring a new Experiment, you may also gain 1 corresponding material or essence.
08. Benefit: When performing an Experiment, the Mastery track requirement is always 1 less for you.
09. Benefit: When acquiring an Artifact, you may always acquire any Artifact, regardless of the color of your die.
10. Benefit: When drafting an (Infinity) die, also gain 1 Chameleon token.

это 8 "джокеров", они заменяют обычных серых/коричневых парней на старте, ну и используются вместо них на протяжении игры