Buffy’s death in 1.12 Prophecy Girl, albeit very brief, was enough to activate another Slayer, Kendra. The two met in season two’s 2.09 What’s My Line? (Part One). Giles said in that …

Anya mentions some alternative universes in 5.11 Triangle, including the Land of Trolls, the land of perpetual Wednesday and the world without shrimp.

Hailing from the dimension of Pylea, Anagogic demons have distinctive green skin and small red horns protruding from the forehead. Known for their tracking and hunting skills they have the …

Xander discovered he had a better sense of smell after being a hyena in 1.06 The Pack, when he tried to sniff out a werewolf in 2.15 Phases.

Anyanka’s look as a vengeance demon changed over time between the episodes 3.09 The Wish and 7.05 Selfless. Over time, does the face of a vengeance demon get deeper groves in her …

In 3.09 The Wish’s alternate reality Giles states that:

“In order to defeat Anyanka, one must destroy her power centre. This should reverse all the wishes she’s granted, rendering her mortal …

Aradia is the Goddess of the Lost. She appears as a small light to guide those who are lost. In 4.04 Fear, Itself, Willow called upon Aradia using a guiding spell …

Arashmaharr is a world or dimension in which D’Hoffryn, the head of the vengeance demons, resides. In 4.09 Something Blue, Anya attempted to summon D’Hoffryn using the spell, “Blessed be, the …

An Ascension is when a mortal or part-demon becomes pure demon, resulting in massive destruction. In 3.21 Graduation Day (Part One) Anya revealed she was the only living person to witness …

Some demons have the ability to ‘infect’ those who come in contact with them with an aspect of themselves. In 3.18 Earshot, Buffy became infected when she absorbed the blood of …

The Axis of Pythea, seen in 4.02 Ground State, is an ancient power that bridges all dimensions. It was forged from the tripod of the Delphic oracle into a metal …

In 3.18 Earshot, Giles and Wesley are still drawing a blank about the Mayor’s Ascension, despite Buffy and Angel’s attempts to get information from Faith in 3.17 Enemies. They both confirm that …

The General of the Knights of Byzantium fills Buffy and Dawn in about Glory and the Key in 5.20 Spiral. He says of Glory, and her fellow hellgods:

“Along with the beast, …

During season four, the Government captured Spike and implanted a Behavioural Modification Chip in his head in 4.07 The Initiative. It rendered him incapable of attacking humans without intense neurological pain, …

Beljoxa’s Eye is a huge eyeball covered with smaller eyeballs and chains, seen in 7.11 Showtime. It exists in another dimension (seemingly a black wind-tunnel), of which only demons can open …

The Mother Bezoar was a prehistoric parasite living underneath Sunnydale High, seen in the episode 2.12 Bad Eggs. The mother lays white eggs, similar to chicken’s eggs. Whilst inside the egg, …

The bewitched beer sold in the college pub in 4.05 Beer Bad was called Black Frost. The beer was enchanted the barman Jack’s brother-in-law, who just happened to be a warlock. …

We discover in Somnabulist that vampires who are linked by blood (such as a sire) can sense each other’s presence and can be physically linked in dreams. This occured when …

In 5.21 The Weight Of The World, Giles discovers that Dawn’s blood is the key (no pun intended) to the ritual that will allow Glory to open the dimensional portal to …

In 1.03 The Witch, Catherine Madison performed a Bloodstone Vengeance spell on Buffy. Giles explained that the effects of the spell hits the body like a “quart of alcohol”, then eradicates …