Minimum Tablets

Minimum Tablets is Merlin's magic item No. 172, which is a miracle pill made from the Chicken-Matango's spores.

Background
After Diane's clothes were torn apart during the battle against Hendrickson, Merlin offered her the pills so that Diane could shrink down and wear human clothes until her tattered clothes were remade.

Abilities
Based on the spores released by the Chicken-Matango, the Minimum Tablet is capable of shrinking the size of its consumer, effectively allowing a giant to pass off as a human. The effects of one single pill can endure up to seven hours.

It's implied, but not outright stated that this magical medicine can also be used by giants to produce offspring with smaller races. Both Diane and King believed having a child was possible; it came up indirectly during a conversation about which of the Sins‘ offspring would beat the other in a fight.

Trivia

 * Minimum Tablets happened to resemble a Japanese candy called Konpeito.