flame, brilliant, blazing
爓 centers on intense, bright fire: a flame that is brilliant and blazing. The meanings all point to vivid, radiant heat and light.
爓 combines 火 (fire) with 閻, which likely contributes the sound and may relate to a gate or enclosure, but the exact historical development is uncertain.
The fire radical 火 on the left is paired with 閻, which looks like a gate with something inside. Imagine a gate opening to reveal a brilliant, blazing flame that lights everything up.
For エン, picture the brilliant flame as the centerpiece of an enchanting scene: enchanting -> エン, and the fire is so bright it feels magical.