That said, thats based on my own perception of the Sidhe as being the remnants of an ancient but dying race such that there are not enough of us to actually form entire nations and armies of our own. I feel that this would give them a unique 'feel' compared to the already fairly magical elves. If we want to go the 'there are plenty of Sidhe now' route, which is okay... Lyssia's Sidhe Sanctuary could easily account for the sudden influx of new Sidhe, then those divisions by mage type seem lovely.
Here would be my suggestion... we might need new names.
Animated Armor - Type 1 - Countless years of conflict have made old suits of armor easy to come by. Sidhe weave Art into the metal to bring it to a semblance of life, but the magics holding together the armor can be severed easily.
Homunculi - Type 2 - Humanoid forms crafted of clay or wood, which move into battle with single-minded determination, animated by a core of Art.
Battle Orb - Type 3 - An orb roughly 10 feet in diameter which flashes with stored magics, lashing out at foes with bolts of energy and destruction.
Golem -Type 4 - Constructs of Iron, Stone and Crystal, Golems tower over the other troops of the Sidhe forces, and act to anchor the combat lines of the Sidhe.
Still at a loss for scum. I was thinking something like a will'o'wisp, but... thats already taken. Mage-Servant? Animated Rope?
Alteranately, if we want to go darker... I note we don't have 'animated skeleton' claimed yet, so that could be type 1, and we could move Homunculi to Scum, as that *might* fit.