Though, like I said, I just thought of it, so I just rushed to Google a winner. Instantly, I thought of any possible D&D dragons, and I wasn't disappointed to find the info of a Purple Chromatic Dragon.
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Le reference pic, from Dragons Wikia:
This is the reference info from Wikipedia:
Quote: Wikipedia
Purple dragon
- Breath weapon: A purple dragon's breath weapon can take on three different forms. It can manifest as a cone of searing energy, a burst of blinding power, or a deadly blade of pure energy.
- Terrain: Temperate Plains
- Alignment: Lawful Evil
- Notes: Described in the Dragon Compendium Vol. 1
- Long, lean bodied dragons with deep purple to midnight black scales. These fancy themselves to be the lords of all dragonkind, believing themselves arisen from the long dead sister of Tiamat. They are among the most intelligent of dragons, able to gather and control vast numbers of minions. Their energy-related attacks make them powerful fighters.
Plus more info from the Dragons Wikia:
Quote: Dragons Wikia
A purple dragon is a talented manipulator of other creatures. It achieves control through lies, misdirection, and direct mental domination. A purple dragon might seek control for any number of reasons, including sheer delight in bandying its power about, a desire to form a bulwark of allies and thralls for security, or curiosity about newly discovered tunnels or crevices leading to unknown areas deeper below, for which recruiting bands of disposable explorers might serve its purposes.
...That last quote actually might explain how the TLoS producers got their ideas for Malefor.