I’ll hopefully be playing an apprentice character soon, who specialises in creating fire. Creo Ignem is not a combination of Arts in Ars Magica which gives a breadth of utility (not like Rego), but I’m pondering some small useful spells anyway. The spell below would be handy in the field while camping and also in a castle.
A Hearth Both Comfortable and Warm
Creo Ignem 15, R: Touch, D: Sun, T: Individual
Creates a warm and healthy campfire or hearth fire which sustains itself without fuel for the duration of the spell. The fire emits light and heat, but will not emit fumes, and has difficulty burning other substances. For combative purposes the fire will not inflict damage unless it is applied for a prolonged period.
(Base 4 for an unnatural fire, +1 Touch, +2 Sun)
The base effect level here is a little hard to grasp. You’d think it would be easier. Creating a fire like Palm of Flame (Ars p139) is an unnatural fire which is hand sized, so I used that as a basis and increased it slightly. That also matches to the Muto Ignem guideline which deals with unnatural fire having a base of 4 as well. I first thought the guideline should have been level 2. Ah well.
The same effect might be enchanted into a magical device, to sustain an entire castle. It would have been nice to have the final effect level be a multiple of 10 to save a little Vis. The effect could be reduced to Target: Room, and increase the number of uses, or even kept down at a single hearth per use and been lower – but that is sacrificing utility for Vis, which was not my aim. There are also spells which might heat the air in the castle directly (MuAu/Ig), or warm all the inhabitants, but they are less desirable as they may cause warping.
Enchantment: Every Hearth Both Comfortable and Warm
Creo Ignem 30, R: Touch, D: Sun, T: Structure
Final Effect Total: 31
Creates a warm and healthy hearth fire in every hearth throughout an entire structure, which sustains itself without fuel for the duration of the spell. The fire emits a pleasant light and strong heat, but will not emit fumes, has difficulty burning other substances, and can not inflict damage. A single hearth within the structure must be touched by the item when the power is invoked.
With this effect a hearth can be added into any room within the structure and it will automatically gain the benefit of the safe fire when the item is next used.
(Base 4 for an unnatural fire, +1 Touch, +2 Sun, +3 Structure)
Effect modifications (+1 for 2 users per day)
Once the item is present wizards might decide to heat up a room a little more by adding extra hearths. This is more an effect that a Master wizard might cast spontaneously.
Conjure the Cozy Hearth
Creo Terram 10, R: Touch, D: Sun, T: Individual
Conjure a fireplace, hearth, and flue made from dressed stone at the location touched. The hearth is not automatically connected to any ventilation, but will stand stable and sturdy. The exact dimensions are chosen when the spell is cast, but the fireplace is not ornate unless a suitable finesse roll is made.
(Base 3, +1 Touch, +2 Sun)
As a side use, the caster could easily block a door with this spell, or conjure them off the side of a wall to crush invaders. More custom spells can be found in the New Spells for Ars Magica page.