Letting out such a gasp wasn't out of context.
The pill in Kent's hand demanded such a reaction, especially since it is something that can't easily be achieved by even the best alchemist.
In the field of alchemy, there are all kinds of pills ranging from Tier 0 to Tier 100. The peak of pill-making is Tier 100, something only Pill Celestials can achieve.
A Tier 100 pill is stronger than even a Supreme. The reason being, at Tier 18 and above, pills gain sentience. So the higher the tier, the more intelligent they become.
However, while a Tier 100 pill can be comparable to a Celestial cultivator, there is one type of pill that can't be placed on a scale.
These pills are known as Dao Pills.
They have no grade, nor pill rings.
However, to concoct a Dao Pill, one had to be well-versed in the art of that Dao, their understanding extending to a firm grasp of a major aspect of it.
The pill in Kent's hand is the [Realm Ascension Pill].
