Artisano is fond the spell Pilum of fire (or if he isn't already that's going to be the next personality trait from the familiar bond) so Ranulf and Artisano are going to enchant the ability to produce something very much like it into his familiar bond.
Here's a recent thread about this sort of enchantment.
The two of them can instill a level 45 effect into the bond in a single season, this would let Artisano throw Pilums of fire for no might cost and they'd have two mastery points left over (perhaps for multi casting and fast casting). That would be great, but they decide that if this is worth doing at this point in their lives, it's worth doing in a more impressive fashion.
They spend a single season researching this spell for the similar spells bonus. Just working on the enchantment for three seasons gives almost the same final level as spending one season researching the spell then two on the enchantment benefitting from the similar spell bonus so why not have the spell too?
Then two seasons instilling the following effect in the familiar bond
Artisano develops an irrationally great fondness for Pilum of Fire style effects, Ranulf's love of flying increases.
The description of a greater power says
After reducing the power's cost to 0, I had eight points left.
*Multi casting and fast casting were used mostly as is but I restricted multi casting to 4 bolts rather than 9 which just felt excessive.
*I used something akin to penetration mastery to improve the effect's penetration by 8. This was much better than just adding 5 xp to Artisano's penetration score (which didn't make any sense from a setting perspective).
*While mastery points can be used to increase initiative I used four of them in a manner akin to quick casting mastery to add to both initiative and to fast cast speed.
*I used one to allow the production of bolts of flame that aren't as likely to flat out kill a target (and that can themselves serve as a target for Ranulf's Talisman enchantments of Pila of Unmatched Heat and Pila of Jagged Bone, although Artisano at present is not large enough to hold the staff in the proper way to trigger these.
So there's some things that might benefit from scrutiny in this effect.