This is great, keep it up
One question, will Lucy become Master for all Servants or there will be other Masters in Fairy Tail?
Will Natsu get a Servant? Still good job.

Please update! I’m loving it! Can lancer and Lucy maybe have some romance? Or maybe put the next key as Archer.

pffft just Angelica and lancer need to use Gae Bolg? pffft

hmmm, is it just me or the cu chulain is too weak here?

Make more it's awesome so far and there isn't enough servant action

This is great need more chapters and more servants involved like Gilgamesh and king Arthur

Keep going with this fiction it's good.

Please update!

So, which crimson key is Lucy going to come across next, I wonder? And which heroic spirit will appear next? Maybe Lucy is gonna wind up being called Mommy! Hahahahahahahahahahahah!

Loved it! Please Update soon.

Please update!

CAN’T wait until Lucy either finds another Crimson Key or she finds another Servant to fight! It’s gonna be so cool

Cu Chulainn has been acquired by a fluke but still Lancer as the first one to join I can see that really happening.

I really love this story! Though I do have some advice to offer. First, I noticed that there may be some romance between Lancer and Lucy, if so I'd advice for you to take it extra slow. A lot of fanfictions I read lack that, they tend to show that Lucy(since I read a lot of fanfics involving her) begins to realize her feelings way too early on then tries to hide them for a certain amount of time before finally confessing or the guy finds out. It's rather cliché... Just take it slow and let their relationship build if Lancy (new ship name that I just made up) is what you're leaning towards.

Second, I also took note of that you're not using her celestial spirits as much. And though yes, I understand you want Lancer to get in on the action and maybe it was just the arc is why you didn't really implement them, but I advise for you to use them a bit more.

Third, it seems a bit odd to have people of Earthland to know about servants and stuff. Like the worlds they come from is quite different from one another, so unless Lancer or some other servant told them then even the slightest bit of information about servants is rather weird for Earthlanders to know on their own.

Lastly, this is just my personal opinion, but in the Erza and Lancer fight, he seemed a bit too OP. Like no doubt is he strong, but so is Erza. You kind of ended the fight a bit too early.

Anywho that's it. This is my favorite fanfiction and I REALLY hope to see you continue this soon 3 It's so good that i'm about to have a few friends of mine and some people in an anime community i'm in read this. KEEP UP THE GOOD WORK!

Saber modred
Caster gilgamesh(alot less arrogant)
Assassin scathach
Beserker asterios
Rider iskandar
Archer kid gil or oda nogabuna