With Novus, the maximum limit you can add is +75 in attribute stats except for Vitality and the main attribute for your class (STR, DEX etc.), with the maximum cap of a single attribute being 31. So for instance, you could have no more than +31 Crit Hit rate or Spell Speed etc.

Once you feed your relic scroll enough materia of a lower tier, it won't accept any more and you'll have to give it the next tier up, ending up at Tier IV if you're aiming for the +31 cap in one attribute and can get to be fairly expensive. If you're going for glamour only though, you can feed the scroll loads of Tier Is across all the applicable attributes it displays, and once you reach the +75 limit, you take it to Jalzahn and he will infuse the scroll with your relic to get you to the Novus stage proper.