AKA: anguinum; glain y nidir; mân macal.
Druid's Egg (also “glain,” “serpent's egg,”
or “snake stone”) was a talismanic object sacred to
the Druids. Tales about it resemble those of the Philosopher's
Stone sought by the alchemists. Its myths may also be related
to those of the Omphalos, a meteoritic stone that was kept at
Delphi and was thought to be the egg of the serpent-monster Python.
In legends, the Druid’s Egg is credited with endowing its
possessor with the ability to obtain almost all he might desire.
truth, the Druid’s Egg was an egg-shaped talisman made of
stone. This consecrated object served as a tool for meditation
and magickal focus, and symbolized the promise of renewal and
rebirth. They could be made from any stone, and were generally
small enough to fit in the palm of one's hand (about the size
of a chicken's egg).
Druid’s Egg appears to have been an object of interest to
the ancients, some of whom describe having actually seen and handled
it. Among those who have specially described it is the Roman historian
Pliny, who claimed he was shown one of these by a Druid from Gaul
and called it an "anguinum."
to Pliny's Natural History, XXIX.52.:
"There is also another kind of egg, of much renown in
the Gallic provinces, but ignored by the Greeks. In the summer,
numberless snakes entwine themselves into a ball, held together
by a secretion from their bodies and by their spittle. this is
called anguinum. The Druids say that hissing serpents throw this
up into the air, and that it must be caught in a cloak, and not
allowed to touch the ground; and that one must instantly take
flight on horse-back, as the serpents will pursue until some stream
cuts them out. It may be tested, they say, by seeing if it floats
against the current of a river, even though it be set in gold.
But as it is the way of magicians to cast a cunning veil about
their frauds, they pretend that these eggs can only be taken on
a certain day of the moon, as though it rested with mankind to
make the moon and the serpents accord as to the moment of the
operation. I myself, however, have seen one of these eggs; it
was round, and about as large as a smallish apple; the shell was
cartalaginous, and pocked like the arms of a polypus."
species of snake do form such a ball in the cold months, but the
few species of snake native to Britain are not egg-layers. A snake
which does lay eggs is the python, not found in Britain, but which
was kept in the goddess temples of the Aegean; this may be taken
as further evidence of an association between the Druids (or their
predecessors) and the Delphic cult which kept the sacred Omphalos
all the historic sources who have testified to seeing this legendary
egg, none claim to have witnessed its creation.
the Druid's Egg is not a widespread tool in modern Druidism, it
is used by some as a ritual implement for grounding and to protect
its owner from manipulative magick or other harmful intents by
acting as a magickal “shell,” absorbing and transforming
any destructive energy.
the Druid's Egg was also believed to create a favorable outcome
in courts of law; enough so that the Romans outlawed carrying
one into any courtroom, and would put to death anyone caught carrying
such an object.
recent times, there has been some debate as to what Pliny is describing:
is it made of glass? is it a type of sea shell? Lately, there
have been some glass baubles found in Wales and Scotland that
some claim are the "eggs" in question, but whether they
actually are or not is unknowable.
Wales, there is still some belief in the objects; they call them
mân macal (snare stones), and glain y nidir (the snake's
Jones' Celtic Encyclopedia
Wiki (The Free Pagan Omnipedia)