Voaraghamanthar & Waervaerendor

Voaraghamanthar the "Wyrm of the Mere" & Waervaerendor the Rapacious Raider are twin adult Black Dragons and sons to Maelestor Rex.

Weszlum & Wulzour

Voaraghamanthar (Weszlum) shared an unusually powerful empathic link with his twin Waervaerendor (Wulzour). They truly acted as one soul in two bodies and their greatest fear was that someone would discover their secret People believe that the 2 dragons are actually 1
Reside in the Mere of Dead Men
Voaraghamanthar and his twin Waervaerendor hatched in the Mhair Jungles, and thanks to their empathic link they managed not to kill each other before hatching. On the contrary, they killed all their other siblings and fled before their parents came back.
After wandering Faerun for a time, they finally found a home in the Mere of Dead Men, attracted by the isolation of the place and legends about the hoard of Chardansearavitriol and the treasures of flooded Uthtower and other realms. They especially hoped to find the lost Twin Crowns of Myrmoran, reputed to have enhanced the empathic bond between the fraternal monarchs of Uthtower and Yarlith and granted them magical powers.
They started posing as only one dragon, named Voaraghamanthar, and soon tales were told across the Realms about the legendary Wyrm of the Mere, a strange black dragon that could appear out of nowhere to assault adventurers.