5e has done some weird things with Celestials.
Like instead of going with traditional Celestial Races, aside from Angels, like pre 4e Eldarin, Guardinals, Asurus, and Archrons, they they turned several none Celestial creatures into Celestials, like Unicorns and Pegusus which were Fey/Magical Beasts in previous editions, and turning the Couatl which had been Magical Beasts/Native Psionic Outsiders into Celestials (and the main type of Celestial Conjured as Angels are too powerful to Conjure). Even Empyreans (Titans) weren't Celestials originally, although I think that was the influence of Pathfinder on 5e. They are now, even the Evil Empyreans are Celestials and the most powerful Celestials being the first none deity Celestials to outshine Solar's.
As for Angels no mention of the name Aasimon. And they kind of created an upgraded version of 4e's Angels creation story. The Angels aren't simply the Servants of the Gods, a good God creates them from their Essence, Angels aren't created from petititioners, they don't arise from the Astral Plane itself like in 4e, a God makes them from his\her own Essence, making them effectively extensions of the God, like weaker (or not so weak) Avatars, but with greater autonomy. Which makes Fallen Angels more horrifying in a sense because it's not just a servant of a God who falls, but a piece of that God themselves. So Malkzid, a former Solar of Corellon, would be a part of Corellon who turned into a Devil and Yugoloth.
Also the line between Angels and Empyreans seems blurred since both are effectly the Children of the Gods.
Also there only seems to be one kind of Deva.
Also it seems like Celestial Eldarin (along with Fey Eldarin and the first humanoid Eldarin) will be coming back in MTOFs. By the way the 5e back story for Elves makes them sound like a race of Fallen Devas.
Like instead of going with traditional Celestial Races, aside from Angels, like pre 4e Eldarin, Guardinals, Asurus, and Archrons, they they turned several none Celestial creatures into Celestials, like Unicorns and Pegusus which were Fey/Magical Beasts in previous editions, and turning the Couatl which had been Magical Beasts/Native Psionic Outsiders into Celestials (and the main type of Celestial Conjured as Angels are too powerful to Conjure). Even Empyreans (Titans) weren't Celestials originally, although I think that was the influence of Pathfinder on 5e. They are now, even the Evil Empyreans are Celestials and the most powerful Celestials being the first none deity Celestials to outshine Solar's.
As for Angels no mention of the name Aasimon. And they kind of created an upgraded version of 4e's Angels creation story. The Angels aren't simply the Servants of the Gods, a good God creates them from their Essence, Angels aren't created from petititioners, they don't arise from the Astral Plane itself like in 4e, a God makes them from his\her own Essence, making them effectively extensions of the God, like weaker (or not so weak) Avatars, but with greater autonomy. Which makes Fallen Angels more horrifying in a sense because it's not just a servant of a God who falls, but a piece of that God themselves. So Malkzid, a former Solar of Corellon, would be a part of Corellon who turned into a Devil and Yugoloth.
Also the line between Angels and Empyreans seems blurred since both are effectly the Children of the Gods.
Also there only seems to be one kind of Deva.
Also it seems like Celestial Eldarin (along with Fey Eldarin and the first humanoid Eldarin) will be coming back in MTOFs. By the way the 5e back story for Elves makes them sound like a race of Fallen Devas.