Well then. I claim Providence.
(I have some other... quirks I'm developing about her, so I'm not entirely done, but eh. Have the lore of Providence in the meantime.)
Providence, the Profaned Goddess, is the original source of all old religions and beliefs in the ancient times. She was born of the sun's holy light and the Underworld's dark magic during a great battle between demons and angels long ago. When the combined forces of each side threw every bolt of energy they had at each other all at once it created a massive explosion. Through this, the core of Providence was born. Using magic the core suddenly began tearing chunks of the Terraria landscape apart to form a shell of earth and flame around itself. The two armies, awestruck by what they saw before them, ceased their fruitless endeavors. Providence then disappeared into the sun, with this day being now known as the Birth of the Profaned Flame. From this point forward religions of the profaned flame formed, and long thereafter through the use of some of Providence's old magic (whether the lihzahrd knew it or not) the Golem was created to protect their temple. Though she is both dark AND light these do nothing to impact her natural state of being; she is a neutral god, only destroying those who lay hands on her artifacts and only assists those that pray to or protect her. She resides in either the core of the Underworld or the center of the sun, far too hot for even beings as powerful as the Devourer of Gods to enter. After dispatching her guardians Yharim left his Devourer and his Sentinels to "clean up" both her and the rest. However, due to Providence's ability to conceal her magic extremely well and her natural affinity with nuclear heat the Devourer nor his Sentinels could find her. To this day the Sentinels are still searching, with the Devourer going about his own business until they discover her...or something else more powerful than her... After defeating her guardians the Terrarian come across a chunk of her inner core, odds are she will be mightily displeased if something were to happen to it.
Fire has no desires to speak of, nor does it have pains to lament. It has but a purpose: to burn is its meaning, to turn to ash is its resolve. Such is Providence, a being of alleviating light, and corrupting twilight. Born from a colossal impact of dark and light magic, during the ancient conflicts between angels and devils, her creation was of holy and demonic origins, and her presence embodied that concept in its denial of both. An indifferent crystal, formed in the heat and power of the mana. Within, a conscious spark took a mind of its own. In the midst of the torrent of magic, Providence felt the good, and the evil: the utmost desires of the world, for ill-intent and to live. It was disgusted. Held in limbo between both forces, it began to take a form of its own; from the land itself, a shell of stone, and from the blaze of battle, her wings. Anything her flames swept across was cleansed, purified, and reduced to an impartial ash. In life and death, there is vice, there is virtue. In purity, where nothing lives and nothing dies, neither sin exists. That is her objective. A world cleansed of desire.
However, in the Devourer’s and its servant’s mad search to consume her, such deeds are risky, and the scouring of a world is not an action which would escape its knowledge. Thus, Providence basks in the center of the sun, where she remains dormant, gathering power from the energy of the nuclear fusion. It is there that she waits, patient and dispassionate, to one day be able to descend upon the earth, consuming all in a purifying flame. Nothing would be able to withstand the heat of the Goddess, tempered by the sun, and fueled by a singular purpose. She would leave nothing but an uncanny, sinless world behind. However, if you were able to grasp one of her relics, a substantial core of her power, it would surely incite her wrath. She would descend unto the land prematurely, not having gathered enough energy, nor with her relic properly harnessed, leaving her weak. Her aim would be to reclaim her artifact, and annihilate the culprit. However, with proper exploitation of the method described, a skilled enough opponent could potentially destroy her in battle, to avert the fate of the world.