Fates Warning - Island in the Stream (Submit A FAQ)

Bröcken
A hill (1142 m) in the Harz, a region in the west of what used to be East Germany, close to the former border, about 60 km south of Braunschweig. See "Walpurgisnight".

Ivory Gate Of Dreams
Graeco-Roman: when a dreamer leaves the realm of dreams, there are two gates he can use to exit to the waking world (though it's usually not up to the dreamer to decide which gate to take). If s/he exits through the gate of horn the dreamer will remember the dream, which will be true. If s/he exits through the gate of ivory, the dreamer will not remember, and the dream will be false.

Lemuria
In Roman mythology, the Lemures, also known as the Larvae, were souls who manifested themselves as ghosts. On the Lemuria (the 9th, 11th and 13th of May) they would leave their graves and threaten the living.

Judas Iscariot
One of the twelve disciples of Jesus, who betrayed his master to the Pharisees in exchange for thirty pieces of silver. Judas, unable to live with what he had done, committed suicide.

Getsemaneh
A garden where Jesus went to pray to his father (God), to ask him if he could avert his fate (which was to die on the cross on Golgotha [Hill of the skull] for the sins of all mankind). It was here that Judas Iscariot betrayed him: he kissed Jesus on the cheek to point out to the soldiers this was the man they had to take into custody.

Morrigan
A Celtic war goddess.

Fates
Also known as the Moerae and the Sisters Three. The Graeco-Roman goddesses of fate, according to some the daughters of Anance ("necessity"). It seems even the most powerful god of all, Zeus (Roman name: Jupiter), has no power over them. Clotho ("she who spins"), spins the thread of life, Lachesis ("she who measures"), winds the thread, and Atropos ("the inevitable") cuts the thread.

Morgana
In Celtic mythology, one of the Fairies. These seem to have their roots in both the Graeco-Roman Fates and the Celtic female druids (priests). Other well-known fairies are Melusine and Viviane.

King Nazareen
The Christians' messiah, Jesus Christ, who hailed from the town of Nazareth.

Olympian
Generic term for a Greek god, who were all said to live on mount Olympus (2918 m), in northern Greece, roughly 75 km south-west of Thessaloniki.

Tabernacle
During the forty years the people of Israel wandered the Sinai desert (the triangular piece of land between what currently is mainland Egypt and Israel) after having been liberated from slavery under the Egytian pharao, they built a tent they called the tabernacle, which was sort of a portable temple.

Walpurgisnight
The night between the 30th of April and the 1st of May, when Drudes (not "Druids"), partly benevolent but mainly malevolent witches rode their broomsticks through the skies and gathered on Bröcken to perform unholy rituals.
Note: I don't know what a "Drude" is, but "Druids" were a religious caste associated with loose bands of Indo-Europeans commonly known (culturally) as Celts.

Walpurgisnacht [May Eve] is a Teutonic seasonal festival, known to the Insular Celts as Bealtaine and to modern english speaking countries as May Eve. The concept of "witches" flying through the air and performing "unholy rites" is a product of medieval church superstition, in all likelihood born of a misundertanding of pagan folk magic intended to increase crop fertility for the coming year.

As a side note, some of the ingredients in "witches flying ointments", including the herb colloquially known as "baby's fat", are hallucegens which induce the sensation of flying; there is a great deal of evidence to support the theory that some people accused of "witchcraft" were practising a dimly remembered shamanic tradition (compare with what is known of shamanism amongst the Tsungus & other peoples whose magico-religious systems incorporate shamanic practises).

Tartarean
Tartaros is, in Graeco-Roman mythology, the name for the deepest part of the underworld, where criminals receive their punishment.

Spectre
The first mountain climbers noticed this strange phenomenon: they thought they could see giant gods walking in the clouds, while in fact these were their own shadows, projected onto the clouds when they were in a specific position relevant to the sun.

Hydra
In Graeco-Roman mythology, the Hydra of Lerna was a giant water snake Hercules (son of Zeus and Alcmene) needed to kill as part of the twelve chores (dodecathlus) he had to perform for king Eurystheus. Every time Hercules cut off one of Hydra's heads, two new heads grew in its place. He managed to beat the snake by lighting a nearby forest on fire and searing up the wound with a burning tree where he had cut off a head. He buried the ninth head, which was immortal, under a large stone. He dipped his arrows in the Hydra's poisonous blood, which he used to kill the Stymphalids, giant birds with steel claws and beaks.