NJ, I hope I am not stepping on your toes with the whole staff mod thing. It was simply a way to prove a point to both myself and the community concering the idea of an item that gave abilities as a unit leveled. So what is the goal of your mod?
The goal was just to get some usable examples out there more than anything and possibly provide some ideas for others. There are two unlockable abilities used at the moment, but are unlocked by getting shards. Will keep the unlocking with the focus on shards for now (maybe making the abilities a little more powerfull that yours). That way there will be some staffs that you can always make use of all abilities, but have to level up to get them and some staffs that you need a bit of shard luck to get. As well as makeing another reason to go to war over shards.
Its why I think your mod works; you are adding a kind of basic equipment for casters, not something deep and involved. I will just say right now (IMO) the state of the game lends itself more to creating basic's than the nifty complex stuff (item sets, etc you describe)
Will try to keep it all simple for now then. No extra attributes or resources etc. Will see what I can do within those boundaries. Next ability I'm going to play around with is for the fire staff. +50%-100% extra attack for 2 rounds followed by your attack being halved for 3 rounds after and can be used every 5 rounds. Kinda thinking along the lines of powerfull abilities that have an overall drawback in the end.
For general guidlines I'm thinking something along the lines of:
Research Channeling: (abilities are effected by all shards but start weak)
Life: Heal "attack"Melee attack, healing abilities, (current healing attack to be changed to ability with no cooldown)
Death: Melee attack, Infrequent AOE attack ability, self Boost strength based on int with penalty to int, drain target friendly health to boost its attack?
Research Relavent book: (all have ranged attacks based on int and abilities are effected by related shard)
Fire: Single target Damage abilities, buffs and debuffs.
Earth: Single target Defence abilities, buffs and debuffs.
Air: AOE Damage abilities, buffs and debuffs.
Water: AOE Defence abilities, buffs and debuffs.