How can a summoner discover new spells?

There is no definite list of spells. There is a default library of spells that can be discovered or otherwise acquired and this core list will grow over time, but this is just a foundation to whet the appetite.

Players are encouraged to seek new lore and invent new spells. Each turn a summoner may attempt to perform research. This is quite an open-ended action, but the more elaborate, ambitious ideas will be less successful or longer to achieve. Attempting incrementally more powerful and complex spells of a similar nature will meet greater success.

A good example:

Research: attempt to create a spell, called 'fireball'. This spell is primarily and solely a fire spell. It can be cast by the summoner to launch a flaming projectile at a target on the map - something small, such as an enemy structure or army, with a range of 3 hexes.

Result:

Spell: "Fireball"

Cost: 1F

Effect: Launches a ball of fire at an identified target in a hex up to 3 hexes away form summoner's position.

This example is quite detailed, but the more detail provided helps tune the intended spell and the result is spot-on.

Poor example:

Research: a new spell to attack enemies from my base

Result:

Spell: "Flinger"

Cost: 1

Effect: Throws a minion at target enemy army or structure from a summoner's keep. This minion will then attack the target.

In addition to manual research:

• Minions of an appropriate nature can assist in acquiring new spells. Some can simply help research to improve the success rate. Others may be sent to spy or steal information.
• Spell scrolls can be discovered in ruins or treasure caches.
• Other summoners, gods and beings can attempt to teach you spells.