general god-sparked class.
Ascension
Lvl 1
3 spells/abilities ( at least one is a given one from a relevant domain)
Lvl 2
First channel divinity, 3 spells/abilities ( at least one is a given one from a relevant domain )
Lvl 3
Second Channel Divnity, 3 spells/abilities (at least one is a given from relevant domain)
Lvl 4
Third Channel Divinity (can be from another domain if you're only associated with one domain), 3 spells/abilities (at least one from relevant domain)
Lvl 5
3 spells/abilities, 17th level domain super power thing, ultimate/unique power that they possess that is only theirs. Ultimate Ascension, all spells and abilities come far more easier to them, and their battery is as large as ever. They can do far more. Likely also includes just basic ability to inspire those around them.
Magic Spells: Domains can be used to determine some of the abilities and the magic spells that can be used at each level, but these abilities and spells will be altered to make them more fitting with a god-sparked one. God-sparked will not have specific limits on how much or how often they can use these abilities. These abilities/spells will also be more powerful, ore intense, more malleable than the basic versions of the spells, and any spell can be replaced by a more appropriate super power if desired, but be sure it fits the level of ascension that you are ascribing it to (i.e. no giant fire balls and level 1).
While there are no hard and fast limits, there are limits in the sense that the first time doing a ascension level 1 ability might be taxing whereas doing it at ascension level 3 is a piece of cake. They grow and learn as they experience and use the powers at their fingertips.
*In addition to magic spells and abilities, they will also gain innate talents, which can vary based on the individual and the domains they are associated with. For instance, Elena starts out with Sense Suffering and Radiant Glow. This does not count as one of the 3 spells/abilities that she can use.
Unique Ability: Each god-sparked has a unique ability that only they are capable of doing, which directly relates to the spark within them. No others can do a spell or ability exactly like them.
Godspark Battery: There are limits to what the godsparks can do, and their battery will grow with ascension level. The battery glows when in use, and the dimmer the glow when it is being used, the less power that is available. Eventually, they can pass out from lack of radiant energy or find their powers simply do not work at all (sparks from their fingertips that have no effect).
Path to Ascension: This is unique for each individual, but it should start with easier tasks and then eventually move into more difficult tasks. The most difficult task to do is what should help them ascend to the final level, but this has to be worked out for individual characters. What is most difficult and painful for them? What would be the hardest thing to do while still keeping true to the godspark within?