Angel dragons blended with epic fantasy? That's a wonderfully specific craving, and it's trickier than you'd think. A lot of 'dragon romance' out there leans more on the fated mates or shifter-pack dynamics, but the celestial, truly epic-scale angelic dragon is a rarer beast. Most recommendations you'll see, like Rebecca Kenney's 'A Deal with the Dragon King' or Jennifer L. Armentrout's 'From Blood and Ash' universe, have incredible dragons and sometimes angelic-adjacent beings, but the core fusion you're after is a niche within a niche.
My absolute top suggestion, the one that made me yell 'THIS IS IT' into my pillow, is 'The Aurelian Cycle' by Rosaria Munda. Start with 'Fireborne'. It's not marketed as 'angel dragon' per se, but hear me out. The dragons are genetically engineered, near-mythical creatures of immense power, and the societal structure built around their riders has this intense, quasi-religious, almost divine hierarchy. The political maneuvering, the class warfare, the moral weight of power—it's epic fantasy through and through. The dragons feel less like pets and more like forces of nature, and their bond with the riders carries a gravity that hits those angelic, destined notes without the typical wings-and-halo imagery.
If you want something with more explicit angelic lore woven into the draconic, 'Dragon Bound' by Thea Harrison has elements, though it's more urban/paranormal fantasy epic in scale. The series builds a massive world where Elder Races, including dragon-shifters of primordial power, exist alongside magic users. The later books explore more celestial and demonic conflicts. For a pure, world-ending epic plot with creatures of light and shadow, check out 'The Last Dragon King' by Leia Stone, part of the Kings of Avalier series. It leans into the 'chosen one' tropes and has that large-scale war between magical factions you might be craving. Honestly, half the fun is digging through Kindle Unlimited with the right keywords—'celestial dragon' or 'holy dragon' can sometimes unearth those hidden, self-published gems that perfectly stitch these two concepts together.