RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Adamantite Short Sword
The Old School RuneScape Wiki also has an article on Adamantite Short Sword.

An Adamantite Short Sword is a short sword which requires at least level 30 Attack to wield. It can be purchased from Varrock Swords, or made at level 74 Smithing from 1 adamantite bar, yielding 62.5 experience.

Dropped by

They are dropped by:

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