I think there is no need to pay anymore, many relic+1 people are doing the fight.
My team beat Titan on my second DF (yes, it's possible) and it was definitely not thanks to me...
Those guys were so good, I was dead half of last phase and they finished by themselves and I passed Titan...
Now need to practice Titan with the relic to stand on my 2 feet till the end before testing the coil

but frankly, don't pay for that fight, just do DF until you clear or ask help in your FC
Its just a fight and with geared people it takes what? 20minute?