Shadow Dragon Scales

Shadow Dragon Scales can be used by Cromwell to make Shadow Dragon Scale (body armor) out of it for about 5000 - 7500 gold. This item appears in Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition. It's dropped by Thaxll'ssillyia in the ruined temple area in the ruined temple of Amaunator.

In-game description
"These heavy scales glisten under the light and are warm to the touch. There are a significant number of them salvaged from the corpse of the shadow dragon... perhaps they might be useful in the formation of some kind of shield or armor."