V-Human Feat Great Weapon master (Great Maul)
Spell-less Ranger(Hunter)5 DragonSorceror6 Runescribe2
-GWM (for -5/+10 effect, won't use BA option unless GFB is not worth it
-Ranger maneuvers

recision Attack and Sweeping Attack and extra attack option
-Sorc for Haste spell, GFB and Sorcery points for quicken. At Level 6 adds CHA to fire damage to GFB damage
-Runescribe 2 for Fire and Earth runes (Have both weapon buffs in affect)
Start by using your GFB BA, make an attack on each character (Expending Superiority die if needed to hit with precision), fire rune lets you reroll damage, if you roll max damage you also prone the target from the earth affect. This makes the rest of your attack this turn have advantage. All other attacks also have fire traits and reroll damage from fire rune affect. (You also use sweeping attack from the weapon attack on this move if you didn't use precision attack)
From here you make your standard action attack on the main target and sweeping attack each time with superiority dice
Finishing with Hasted standard attack with sweeping attack if you have enough superiority dice. You also get an attack on the 2nd target from the hunter horde breaker.
This totals for 4 attacks against the main target with GFB extra damage and 1 normal attack and 4 sweeping attacks (most likely) and GFB extra damage against a 2nd target within 5ft. Most of these attack have a chance to have advantage from proning.
What do you think?
Haste yourself. This gives you 2 normal attacks (each one triggers sweeping attack), 1 hasted attack (also triggers sweeping attack) and a quickened Green-Flame Blade (which hits two targets and the 2nd target also gets sweeping attack) For a total of 4 hits on the main target and 5 on the 2nd target as long as everyone is within 5ft.