Okay so I was working on this list before ShaperV's post went up so there's some repeats but I'm keeping them on out of pride. The list is also sort of stupidly long and in no particular order so sorry about that. I'm just throwing ideas out there in case anyone likes them. I'm also sorry about the space-wasting speculation. Sorry about being so sorry.
Cosmetic Alteration(Flesh):
This one is fairly straightforward, the permanent alteration of cosmetic features in ourself and others. Useful for all sorts of plots, sneakiness, adventuring in secret, a foundation for low-level Charm buffs, and general evasion of consequences. Requires Flesh 3.
Permanent Body buff(Flesh):
The permanent improvement of the Body stat. Benefits speak for themselves. Requires Flesh 3.
Anti-arrow shield(Force):
The use of force magic to prevent Dominic from getting hit by projectiles, basically. Quite useful in my opinion, stray arrows are a dangerous liability for many encounters and one that Dominic can't rely on his swordsmanship to defend himself against. Scales from active deflection to a sustainable static defense. Most likely requires Force 2.
Mobility enhancement(Force and/or Body):
This is a broad category of potential projects focussed around using magic to make Dominic faster, more agile, or otherwise able to get around easier. We could most likely start on things like reflexes, jumping strength, and improving our existing speed enhancement at our current level of skill, but probably not much further. I think that Force ultimately has more potential in this area. Force jumps, slowfall, and essentially mimicing Dita's mobility enhancements should be feasible with force magic. Should require Body 2 or Force 2 to get started.
Force fire sword(Force/Fire):
The use of Force and Fire sorcery to arm Dominic with either a "sword" of fire contained by force magic, or a concrete projection of force shaped into a sword and wreathed in flames, depending on the interpretation. Having this spell would mean that Dominic would nearly always be armed with an implement he can use his swordsmanship with, and a magic one at that. Fire as a cleansing element means that it would be particularly effective against tainted entities. I went with this rather than learning to wrap a physical sword in fire because I imagine that would damage the blade and the heat weaken it. Should require Force 2 or Force 3, and Fire 2 to be practical.
Winter operations magic(Fire+Flesh):
A collection of spells and tricks to make travel during the winter safe for small to moderate parties. Fire magic to keep people warm, flesh magic to treat hypothermia or make them more tolerant to cold. Flesh 2 or 3 and Fire 2 or 3 depending on the desired scale.
Tactical flesh buffs(Flesh):
The use of flesh enhancements on a tactically relevant scale. Buffing troops with Dominic's existing suite of short-term enhancements, essentially. This could work a number of different ways depending on how flesh sorcery works exactly. Probably requires Flesh 3 to be really practical.
Basic magical husbandry(Flesh):
This would be a general grounding in the mechanics of fertility, pregnancy, and heredity and how to monitor and ease the processes. The actual research would be done on animals because of ethics but also the much swifter gestation. This would also form the foundation for exploring the nature of human pregnancy. Dominic would probably spend time gaining some skill in the related mundane skill at some point. Flesh 2 is likely sufficient for learning about and assisting pregnancy, Flesh 3 if you want to do anything fancy.
Force imbue(Force):
Similar to Dita's holy imbuement, this would be storing an extra punch of force energy into something to be released on impact. This would probably be fairly effectiev against armored foes. Likely Force 2 to be useful.
Fire control(Fire+Force):
This is the ability to generally control fire in Dominic's environment. Controlling the intensity, duration, and movement of flames around him at range. This would be a great ability for battlefield control or even just firefighting which is a valid concern for the time. Likely includes improving our fire resistance. Should be feasible at Fire 2 and Force 2.
Purifying flame(Fire):
Fire is supposed to be a purifying element, and so it may be possible to push that aspect to the fore in the flames that Dominic produces, to more effective combat taint. This would require collaboration with Kat and possibly help from Dita as well, but could be incredibly useful. I'm hopeful that this is possible to a limited degree at Fire 2, but it may be 3 or even 4.