While adventurer training is somewhat self-determined, everyone gets a very, very good grasp of the principles and fundamentals of using supernatural powers. While not everyone decides "I'm gonna enroll in Advanced Magical Theory 502" everyone does get through 100, 101, 102, and 300 level classes.
While Daeth is indeed your
best caster, being of the second tier of power and capable of casting up to a T6 spell, you guys are, at the very least (keep in mind I am not looking at your profiles right now) sixth or fifth-tier casters and can do T3 or T4 spells.
Tier 0 spells aren't very effective in the sense of them costing more than others and taking more effort for less gain. Think along the lines of candle flames, 1lb telekinesis, or Cure Lesser Wounds (at best). It's what a small child or untrained power user would do before training or teaching. They're the Least powers, which are below "Lesser" on the scale.
Tier 1 and 2 spells are beginner-level spells. They cover the range from Lesser to Minor Powers, tending towards lesser. They are "autohit" spells because casters at this level tend to need to focus their energy on actually hitting what they aim at. A simple Potion of Death Resistance, an Ice Dart, or a Dispel Lesser Curse would fall under this category.
Tiers 3 and 4 are intermediate spells, or "average" spells. These are Minor to Normal Powers, tending towards normal. At this point, offensive users can choose to trust their own magical aim for more damage or use the controlled spells for a guaranteed hit. A Potion of Death Immunity, a Potion of Lesser Invulnerability, a Mage Shield, a third-level armor or second-level item/weapon enchantment, Mass Raise Vermin, or a Cure Moderate Wounds would be on this level.
Tier 5 is normal to major spells, or simply put "any spell that is not Tier 4 or a Tier 6." Cure Serious Wounds, a Potion of Invulnerability, Invoke Skeletal Abomination, a seventh-level armor or fourth-level armor/item, a Major Counterspell, or Minor Planar Gate are in this tier.
Tier 6 powers are the low half of Greater Powers. These are things like Mass Raise Dead, Firestorm, Mass Bless, Lesser Quicksand, Baleful Polymorph, Breath of the Grave, Greater Counterspell, Planar Gate, or a ninth-level armor enchant or a fifth-level weapon enchant.
Even if you're going to say "Okay, my character
understands magic, but lacks the individual skill/power/whatever to do all that much" you can still assist with Greater castings, even if it's only "Stand by linked in as a spare MP pool."