Also before someone jumps down my throat about how the Alliance wronged the blood elves, here is my source:
" Kael himself took 15% of the blood elven race (including some of his most powerful and gifted magisters) to join with the Alliance fighting in the equally destroyed Lordaeron. However, this tenuous alliance would not last, and the blood elves came under the bigoted scrutiny of one Grand Marshal Garithos. Garithos, a human who had felt wronged the high elves’ conduct in the past, consistently gave the blood elves either meager tasks beneath their capabilities, or worse, suicidal missions devoid of reinforcements, in order to rid himself of the sin’dorei.[12]"
ALSO Origin of San’layn is literally in this article:
" Prince Kael’thas led his followers to freedom, to the extra-dimensional wastes of Outland, the remnants of Draenor, and pledged allegiance to Illidan Stormrage, who promised to grant them a new source of magic by teaching them to siphon magic from powerful alternative sources, including demons. Together with their allies the naga, Illidan led the blood elves to conquer Outland, gaining in the process the friendship of the nearly extinct Broken. The blood elves then followed Illidan to the Icecrown Glacier in an attempt to destroy the Lich King; however, they were defeated by Arthas, who wounded Illidan, forcing the blood elves and naga to retreat, allowing Arthas to ascend the glacier and merge with the Lich King. During the battles in Northrend, several of the deceased blood elves (including the powerful bearer of Quel’Delar, Lana’thel) were raised into undeath by Arthas, to serve him as his “San’layn”."
THE FORSAKEN, SO UNDEAD, WHO WERE HATED BY THE ALLIANCE AND STILL ARE are the reason for the salvation of Blood Elves.
" Having rebuilt much their kingdom, the blood elves looked to finding new allies. They had once been part of the Alliance of Lordaeron, but the Alliance no longer cared to defend Quel’Thalas.[6] The blood elves were offered aid from an unexpected source: the free-willed Forsaken undead, one of several established powers battling in ruined Lordaeron, reached out to the bewildered and overstretched sin’dorei. The blood elves were initially wary of their intentions, fearing a trick; but the elves eventually acquiesced, as no one else was willing to fight for Quel’Thalas at all.[6][13]
The Forsaken have been working closely with the blood elves to purge the greater phalanxes of Scourge presence from the Ghostlands since their induction. Lor’themar Theron was Sylvanas Windrunner’s second in command during the Scourge invasion of Quel’Thalas, and many Forsaken were high elves culled from the same battle. The aid provided by the Forsaken has included reinforcements, a number of outposts in and around the reclaimed blood elf territories, and a teleportation device between the Undercity and Silvermoon. Sylvanas claims to have retained a great love for her homeland and its people.[14]"
The Alliance had long since abandoned the Blood Elves by the time San’layn came to be. NOT ONLY THAT, but the Alliance went out of their way to butcher San’layn in the war campaign in Battle For Azeroth.
I am happy to provide sources as a reminder:
“Myself and the sentinels will seal the entrance to trap him and his allies shortly thereafter. Then we kill them all.”
" For ourselves, for my sisters, for the Alliance. We won’t underestimate the san’layn this time. We will keep the Horde off-balance and distracted with swift, targeted, ruthless attacks. "
" A cornered beast is more dangerous than a free one. "
"You’ve done the Alliance, and all of Azeroth, a fine service today, .
We will sleep in a better world than we woke to. That is all that can be asked of us.
For the Alliance!"
Look at the language there. The Alliance are not friendly to the San’layn. They see them as bloodthirsty monsters and the entire point of the war campaign was to slaughter them on the Alliance side, meanwhile the Horde’s point was to get the body (which was a stupid plotline anyway but we won’t get into that).
Some might have the attitude that Horde abandoned San’layn, and we don’t know there. We don’t know where Dreven came from, we don’t know if he accomplished his mission and earned points for his people back then. Because guess what? His mission might have been to delay the Alliance long enough for the Horde to get the corpse…which they did.
Not every San’layn in existence would be on that ship, that would be utterly silly. We don’t know how many remain in Nazmir or the rest of Azeroth, and whether they could approach the Horde again. They were working with Sylv to get a home, clearly. I linked the screenshot above.
Why didn’t they go to the alliance? Maybe because the alliance would and did see them as bloodthirsty monsters and did go out of their way to slaughter them? Yeah. It makes no sense for the San’layn to join the Alliance.
Also, thanks for making me look at the most disappointing thing in BfA. Again. sigh -.-
After looking at all that, I firmly believe San’layn should have joined Horde in BfA, but nope, Blizzard has no idea how to write a coherent story. I HATE to this day how they dangled the carrot on the stick then went RADIO BLOODY SILENCE when people were hoping for news of playable vampyr, then they introduce a new ‘vampire’ concept while ENTIRELY IGNORING this lore San’layn fans fell in love with. Grrrrr… People wonder why I absolutely hate the Venthyr, well there it is in short form.