[url=https://safebooru.org/index.php?page=post&s=view&id=2146918]Hat obtained on arriving in the modern day. She's got to [i]look[/i] the part of Caster.[/url]
[list]
[*][b]Class:[/b] "Caster" (Foreigner)
[*][b]Identity:[/b] Kezia Mason
[*][b]Alignment:[/b] Chaotic Evil
[*][b]Stats:[/b]
[list]
[*][b]Strength:[/b] E
[*][b]Agility:[/b] C++
[*][b]Endurance:[/b] E-
[*][b]Mana:[/b] A+
[*][b]Luck:[/b] EX (E)
[*][b]Noble Phantasm:[/b] -
[/list]
[*][b]Class Skills[/b]
[list][*][u]Transcendental Existence:[/u] EX. What does it do? Nobody knows for certain, but it probably acts as a form of magic and curse resistance by rejection of the same laws of reality as even servants run on.
[*][u]Independent Manifestation:[/u]† A. A skill gained through the dual influence of Nyarlathotep and the World itself--although Kezia must undoubtedly die to become a Heroic Spirit in her future (the past), she is very much [i]alive[/i] at this point in time. Though her existence here is possible via magic, her death would [i]not[/i]--and this paradox gives her immunity to both instant death effects and those that would attempt to use time manipulation against her.
And, of course, she's manifested as herself--though acting as a Servant is far more convenient.
[*][u]Item Construction:[/u] B. She's a witch, it's to be expected.
[*][u]Territory Creation:[/u] B.[/list]
[*][b]Personal Skills:[/b]
[list][*][u]Divinity:[/u] B
[*][u]Servant of Crawling Chaos:[/u]  A+. Basically selling yourself to an Outer God has its perks, even if it's a malicious one. The abilities are far more useful against Servants than her normal witchcraft would be: the ability to create portals of almost any size or dimension, as long as she knows the destination properly, including to somewhere... else to allow the tentacles of some [i]being[/i] to come through. It also allows for small scale manipulation of time: massively accelerating herself for a brief period or even, if "Caster" can react quickly enough, rewinding a second to try and fix something.
Heavy use of these abilities in an area starts to distort the geometry of the place entirely.
[*][u]Witchcraft:[/u] A[/list]
[*][b]Noble Phantasm(s):[/b]
[list]
[*][list][*][u]Name:[/u] Hounds of Tindalos - Temporal Stalkers
[*][u]Rank:[/u] -
[*][u]Type:[/u] Anti-Unit
[*][u]Appearance:[/u] Despite the name, calling them hounds is a misnomer... although they have all the persistent hunting ability that would imply, they are not, in fact, canine except [i]maybe[/i] in general outline--nor consistent between them. Some might more closely resemble their namesake, whilst others...
[*][u]Effects:[/u] Not really a Noble Phantasm at Kezia's call, merely a class of phantasmal species that caught wind of her movements through time. Though threatening to a magus and even capable of harming Servants if they get a hit in, she can cow them quite thoroughly into not attacking--fortunately. Where they come in useful is that they will [i]never[/i] give up on stalking their prey, and if they catch wind of anyone or anything not in its proper time period... like, say, a Servant, they will continue to pursue them of their own accord. Seeing as they can materialise from any reasonably sharp corner, this makes them a useful autonomous defence.
She could call them off entirely, but that would neat some setup.[/list]
[*][list][*][u]Name:[/u] Stalker Among the Stars - Endless Recursion of Time
[*][u]Rank:[/u] EX
[*][u]Type:[/u] Anti-Failure
[*][u]Effects:[/u] The greatest benefit of her arrangements with the Outer Gods is this protection--one she can invoke either manually or automatically upon death. In doing so, it will reset her to some prior time point, by default the last point that she actually travelled [i]through[/i] time, with all her knowledge of the preceding events intact. In this case, it defaults to her summoning.
Even with all of her advantages over a normal Caster, she's still a fragile, human magic user, and the Grail War is extremely dangerous. Kezia has fully lost count over the times she's had to go through it all, and is intimately familiar with the people involved, their capabilities, and their identities--even if she's keeping them well under her hat; revealing paradoxical knowledge just makes it harder.
Practically, her foreknowledge gives her unmatched luck (though if things do deviate from her expectations that will revert to its baseline value) along with simulating the effects of Clairvoyance, Instinct, and Eye of the Mind (True): when you repeat things until you can survive, it's quite hard to be surprised or NOT come up with a new plan.[/list]
[*][list][*][u]Name:[/u] Dreams of the Witch House - Sleeping Portals
[*][u]Rank:[/u] -
[*][u]Type:[/u] Anti-Unit
[*][u]Effects:[/u] By appropriately marking a locale, or cursing a person, Kezia can forcibly teleport them to herself whilst they sleep--wherever or whenever it might be that she actually [i]is[/i]. Upon awaking, the target will be exactly where they fell asleep, as if nothing had happened at all--possibly not even physically moving, due to the witch's knowledge of places not quite in step with normal time.
Quite useless against Servants, due to their not sleeping, but it's a good way to get a Master alone for a chat.[/list][/list]
[*][b]Changes:[/b] She is not, quite noticeably, a decrepit child-sacrificing old hag yet. She DID come here straight from the Salem Witch Trials, though.[/list]

† DO NOT LOOK THIS UP. All the info about it (except Saber Ryougi) is in spoilers. Oh, and Merlin haxxed it to show up.