Abdeel (5e Creature)
From D&D Wiki
Just as the abishai were mortals who won Tiamat’s favor, each abdeel was once a noble paladin who gained favor with Bahamut before death and, as a reward, found their souls transformed into powerful angel-like beings to serve him.
Bringers of Light. Abdeel are Bahamut’s emissaries, just as the abishai are to Tiamat, representing his interest across the multiverse. As such, abdeel are also compared strongly to Angels, of which they serve a similar function too. As a result, they often come in conflict with the abishai, like how Bahamut does with Tiamat.