Woken up by a phone ring. And thunder clashing!

You wake up in your king-sized bed with a phone ringing. You look at it, it's 4 AM.

"Hello?" You said tiredly.

"Good morning, Anthony. I've made it to my apartment. I'm going to summon my Servant after this call, I'm just telling you to meet me in Chinatown, at O2*."

(*O2 is a boba tea store)

"I'll be there... in a bit..." As you end the call you immediately fall back asleep only to be thrown out of your bed.

"ow..."

"Wake up! You said you were going to meet your Master 25 minutes ago!"

"It's been that long?"

"Yes, now get your ass up, put on some clothes make yourself a coffee or whatever, I'm going outside to take a smoke, you better be outside in the next maximum of 10 minutes." She said trying her best to handle your shit.

You bring out a loud yawn to wake yourself up. You make yourself a black coffee. As you pour the coffee you burn yourself on the deafening sound of roaring thunder.

"Master! Did you hear the thunder? I'm going to investigate to see if it's a Servant." Mordred said as she entered your apartment in her silver armor and left just as quickly. You weren't even able to protest before she was out of sight.

Waver POV

"It's great to see you again Master Waver! You've grown quite a lot!" A tall muscular redhead said with a booming voice as thunder crackles behind him.

"It's good to see you again Rider, hopefully, this time we can win the Holy Grail, hope you're not cold."

"No, I'm fine Waver! It's quite a change to be in such a snowy environment!" Rider said his booming still loud, but surprisingly not waking up anyone. "Waver, hate to break it to you. But we've already got a Servant on our tail."

In a moment the gladius of Rider and the broadsword of Saber clashed before putting distance between the two. "What's your classification?" The knight in heavy silver armor asked.

Shit, already? I should inform Anthony before he arrives so his Servant can be ready. I think to myself, before typing out Anthony's on my phone. But before he answers the phone a familiar voice calls out.

Your POV

You try to catch up with Saber, but she's way too fast. As you finally reach her, you El-Melloi, your teacher. So you call out.

"Saber! Wait! Their allies!" Saber stopped, but Rider didn't causing Saber to block the attack, but gets launched in the forest in the process.

"Whoops, I'm sorry!" Rider said towards the forest

.

..

...

No response. That's weird. But you get a telepathic response in your head.

"Master, where are you? I can't find you. It doesn't make sense. I was knocked away that far!" It's Saber, seems like contact is still available.

You weren't even able to tell the she was ok before Rider spoke up. "I'm coming, Saber!"

"No Rider! I just realized what's happening, the forest is surrounded by a bounded field. Likely the work of a Servant." Waver said stopping Rider before he entered the forest. "Anthony, thinking this might be a native Servant, would there be any myths that could fit a Caster Servant?"

"No, not off the top of my head, I can think of an Assassin, Berserker, or Beast class. I mean it could be a Skinwalker, but I doubt it as those are more like tales of evil shamans, not something that could qualify as a heroic spirit or even a cautionary tale of something."

"I see."

"Master, we have a problem... A Servant is circling me. A low, deep cold breath is all I'm hearing. It clearly sounds hungry... It's clearly an Assassin because there's a clear use of the Presence Concealment skill..."

"Shit." You tell yourself out loud.

"What's wrong young Pupil?" Rider responded worried.

"It's Assassin, we need to go assist her, we don't know how intelligent it actually is. So we might end with Saber if we head in there." You said before taking off to the forest. It doesn't take long before you bump into Mordred's back.

"Master! Why did you come to my help? You're just putting yourself in danger!"

"But it could reveal the Servant's True Name!" As you say that, you see a tall, anorexic humanoid creeping behind Mordred. As it seems to attack, Mordred brings both of us prone to the snowy floor causing us to dodge its attempt, but now you can see it clearer. Extremely pale skin, sharp fingers covered in blood. The thing that confirmed its identity with the deer skull on its head. Assassin is definitely a Wendigo.