Upgrades

Tier 2 and 3 Glyphs will require an Apprentice Spellbook, and an Archmage Spellbook respectively. Higher tier books will allow you to cast higher tier spells, use them in automation, and provide additional Mana and Mana Regeneration as a bonus. Once you are able to upgrade your book, upgrading to the next tier of robes will also grant you another boost in casting.

Related:

Magical Armor

Spell Books