A few spells akin to Eyes of the Flame (InIg35, ArM p.141) which enhance the range of observation a Magus can perform, and also demonstrate a fair use for the Faerie Duration: Fire. When writing these spells I found the Fire duration limiting and overtly expensive in terms of how many levels it adds to spells. It really should not be a +3 Magnitude adjustment given how limited the mechanics of its use are, and how rarely it is used in-play.
Ears of the Flame
Intellego Ignem 35, R: Arcane, D: Concentration, T: Individual
Lets you hear a fire and anything within its radius of heat and light up to the size of a large campfire which you have an Arcane Connection to.
(Base 10, +4 Arc, +1 Conc)
And then,
Ears of the Faerie Flame
Intellego Ignem 45, R: Arcane, D: Fire, T: Individual, Faerie
Lets you hear a fire up to the size of a large campfire within its radius of heat and light which you have an Arcane Connection to, while it still burns.
(Base 10, +4 Arc, +3 Fire)
Then two variants designed for use with an Intangible Tunnel which makes the spell far lower level.
Eavesdrop by the Fire
Intellego Ignem 25, R: Touch, D: Concentration, T: Individual
Lets you see and hear a fire up to the size of a large campfire within its radius of heat and light which you can touch. The intention is to combine this spell with an Intangible Tunnel to a particular fire.
(Base 10, +1 Touch, +1 Conc, +1 additional sense)
Eavesdrop by the Faerie Fire
Intellego Ignem 35, R: Touch, D: Fire, T: Individual, Faerie
Lets you see and hear a fire up to the size of a large campfire within its radius of heat and light which you can touch. The intention is to combine this spell with an Intangible Tunnel to a particular fire.
(Base 10, +1 Touch, +3 Fire, +1 additional sense)
Over 650+ new spells for Ars Magica can be found here.