Tiamat, The Chromatic Dragon.

Tiamat is an Imus deity of greed and lies and is the sister of Bahamut, The Platinum Dragon. She takes the form of a massive, five-headed dragon, with each of the heads having a specific elemental nature. Tiamat has the ability to split herself into five dragons, who act independently of one another.
Tiamat was one of the strongest warriors during the War of Great Ruin. She was eventually defeated by Merlonn Grimm near the end of the war, and forced into a mortal form. For centuries, Tiamat worked for Merlonn in the Opal Academy, until in 651PS, the student Ivae Peral freed her from her shackles by killing Merlonn during the Day of Scales and Shaow.
After that day, Tiamat escaped into the Opulan mountains with her warlocks, including Peral, and hasn't been heard from since.

Divine Domains

Greed, Lies

Artifacts

Tiamat's Bag of Hoarding

Divine Classification

Imus Deity