I realize I'm not in the game at all, but I've been lurking.
Covaithe, normally not, but there *IS* a Shaman At-Will power that allows it. Stalker's Strike, I believe it's called. After a successful hit, the Shaman and his allies can flank with the Spirit until the end of the Shaman's next turn.
This is right.
I need to do some reading on conjurations. In particular, if your spirit companion moves, does it draw opportunity attacks?
[sblock=Conjuration Rules]
Conjuration
Powers that have the conjuration keyword create conjurations,
objects or creatures of magical energy.
A conjuration you create uses these rules, unless a
power description says otherwise.
✦ Occupies No Squares: The conjuration occupies
no squares.
✦ Unaffected by the Environment: Terrain and
environmental phenomena have no effect on the
conjuration. For example, a conjuration that is an
icy hand functions in an inferno without penalty.
The conjuration does not need to be supported by
a solid surface, so it can float in the air.
✦ Your Defenses: Normally, a conjuration cannot
be attacked or physically affected. If a conjuration
can be attacked or physically affected, it uses your
defenses. Unless an attack specifically targets conjurations,
only the attack’s damage (not including
ongoing damage) affects the conjuration.
✦ Attacking with a Conjuration: If you can attack
with a conjuration, you make the attack. You determine
line of sight normally, but you determine line
of effect from the conjuration.
✦ Movable Conjurations: If the power you use
to create a conjuration allows you to move it, it’s
a movable conjuration. At the end of your turn,
the movable conjuration ends if you are not within
range of at least 1 square it’s in (using the power’s
range) or if you don’t have line of effect to at
least 1 square it’s in.
When you move a conjuration, you can’t move it
through a solid obstacle.
✦ Death Ends: If you die, the conjuration ends
immediately.[/sblock]
[sblock=Spirit Companion Specific]
You conjure your spirit companion in an unoccupied
square in the burst. The spirit lasts until you fall
unconscious or until you dismiss it as a minor action. The
spirit occupies 1 square. Enemies cannot move through
its space, but allies can. When you take a move action,
you can also move the spirit a number of squares equal
to your speed.
The spirit can be targeted by melee or ranged attacks,
although it lacks hit points. If a single melee or ranged
attack deals damage to the spirit equal to 10 + one-half
your level or higher, the spirit disappears, and you take
damage equal to 5 + one-half your level. Otherwise, the
spirit is unaffected by the attack.[/sblock]
Looks like it doesn't.