If he's not able to close the distance and attack he will call for more holy fire.
If he can't get a melee attack in, Elden will cast Sacred Flame: DC 13 Dex save or take 1d8 radiant damage
Rolls
Attack/Damage - (1d20+4, 1d6+2)
1d20+4 : (1) + 4 = 5
1d6+2 : (4) + 2 = 6
Forgot advantage due to Faerie Fire! - (1d20+4)
(4) + 4 = 8