Spellshaper (Lorica)

Spellshaper
A spellshaper is one who invents new spells or innovates off pre-existing ones.

Guild Spellshapers
Spellshapers are one of the three groups of magic-users in each of the guilds (along with spellcasters and spellcrafters.

Within guilds, spellshapers are looked up to as the authority on all things magic, which (since the guilds are founded on use of magic) means they're the ones in charge.