Ok here goes for the Forest Goblin's own Magic Lore! The idea behind this is to make them as different as possible to their O&G cousins, they are still the same race, but they have lived apart for so long they have grown to have different customs and so on. What with them being a fast moving hit and run style army with no war machines I think it is only fair that they have half decent magic. Unlike the savage miscast table and often fairly ineffective magic that O&G have.
Forest Goblins revere the great spider god as their patron, the sneaky and venomous ways of the forest spiders are mimicked by the Forest Goblins in they way they hunt (and fight) and their magic, though in reality the spider god is an aspect of Gork and Mork of course!
I wanted to stick with a fairly standard selection of spells with a slight twist for their own lore, though I think I will let shaman's choose from the Lore of Beasts, the Lore of Life and the Lore of the Spider.
Lore of the Spider
The fearsome Spider God is a twisted aspect of the greenskins traditional gods Gork and Mork. Greenskin magic normally requires the shaman to focus the mental energy of the Orcs and Goblins around them, though this is not as useful for Forest Goblins as magic of the Waaagh! tends to rely on the mental energy of Orcs, rather than Goblins who have weaker, less useful minds.
Over time Forest Goblin Shamans found that they could channel the latent energy of the Forest and all its myriad creatures, though at the cost that they could no longer summon the wild energy necessary to manipulate Waaagh! magic. Instead they learnt to apply their innate magical ability to the essence of the Forest Mind that they could feel all around them. With the influence of the Spider God this evolved in to a powerful and at times quite unusual breed of magic.
[table]D6 | Spell | Difficulty
1 | Wrath of the Spider god | 5+
2 | Chitinous Husk | 6+
3 | Horrifying Spectre | 8+
4 | Vengeance of the Spider god | 8+
5 | Boon of the Forest | 9+
6 | Corrupted Fungal Blight | 10+[/table]
Wrath of the Spider god Casts on a 5+
The baleful fury of the Spider god fills the shaman causing them to vomit forth a great torrent of poisonous bile. Wrath of the Spider god is a magic missile with a range of 24" that causes D6 S4 hits to the target.
Chitinous Husk Casts on a 6+
The shaman calls on the impenetrable armour of the Spider god to protect a friendly unit from harm. Chitinous Husk may be cast on a unit within 18" even if in Close Combat, if successful the target has a 5+ ward save until the caster's next magic turn.
Horrifying Spectre Casts on a 8+
The monstrous spirit of the Spider god surrounds the targeted unit with a frightening aura. The targeted unit causes Fear until the caster's next magic phase, if they already cause Fear then they cause Terror, if they already cause Terror the spell has no effect. This spell does not stack on a single unit.
Vengeance of the Spider god Casts on a 8+
The shaman calls a great swarm of venomous spiders to attack an enemy unit anywhere on the table. Vengeance of the Spider god causes D6 S4 hits to the target.
Boon of the Forest Casts on a 9+
The shaman calls forth the benevolent spirits of the of the forest to watch over the targeted unit. Boon of the Forest can be cast on any friendly unit within 12" and gives the target Regeneration until the casters next magic phase.
Corrupted Fungal Blight Casts on a 10+
The common blight that infects the fungus reefs of the forests is a powerful hallucinogen, but there is a much more virulent and dangerous form known as Corrupted Blight. Any single model within 18" of the shaman may be targeted (no targeting restrictions apply, this may include a mounted character), Corrupted Fungal Blight bursts forth from the ground beneath the model, its toxic spores erupting in great clouds that will choke an unwary victim. The targeted model must pass an initiative test or take D6 S10 hits.
These are a work in progress, I have taken inspiration from a few places but haven't had chance to think about the balance of the 6 spells together as yet so it is subject to change.