Seed of skill
A Seed of Skill is a one-time use item that increases the skill point total of whoever eats it by 5. It only appears in later Dragon Quest installments that use a point-allocation skill system.
Dragon Quest VIII
The seeds can be found in an overworld chest near Pickham, in pots/cabinets in Neos and Empycchu, and may be purchased once (six times in the 3DS version) from a midnight shop in Arcadia. A small selection of normal monsters drop them as rare items; Solaris, Great trolls, and Crocodogs specifically, with a 1/64 chance for each. Furthermore, all forms of the Lord of Dragovians have a 1/8 chance (a guaranteed chance in the 3DS version) to drop the seed. In addition, super seeds of skill also exist only in the 3DS version. These grant 10 skill points upon consumption; one is obtained from completing the Great Sabrecat card of Cameron's Codex, another is obtained after beating the Ultimate Dragon form of the Lord of the Dragovians.
Regardless of which monster the player goes after, it is 'strongly recommended to make use of Yangus' Stainless Steal Sickle; the acquisition chance will be cut in half, but being able to attempt stealing multiple times in one battle is well worth the trade-off.
Dragon Quest IX
Unlike in Dragon Quest VIII, characters can generally gain more skill points through revocation so these seeds aren't as useful.
Dragon Quest XI
Unlike previous games, each seed of skill bears only one skill point to the consumer.