One of the biggest issues in the game at the moment is the lack of ways to get Spellements in an efficient and not time consuming manner. The best example of Spellement implementation at the moment was with the Karamelle spells. The fact that you would obtain the tier 2 version by the end of Karamelle just by going through the world was nice. However it isn't perfect. Here are some changes I would make to each of the different Spellements currently in the game.
Karamelle Spellements - Increase the Spellement drops in bosses. Very simple fix that should help with a lot of time consuming grinding. Have each boss drop a minimum of 1 per fight and the final boss around 5 per fight due to how time consuming it can be.
Grizzleheim Lore Spellements - In Grizzleheim you can fight King Borr by using a Skeleton Key per fight. However, Skeleton Keys are very rare and most of the time are inaccessible. So the fact that for each fight you may not even get any spellements is absurd. Increase the Wooden Key Boss to drop 1 per fight. The Stone Key to drop 4 or 5. The Golden Key to drop 10 to 15.
Rank 1 and 2 Spellements - Just have them drop from common mobs in Wizard City or just exclusively bosses you would normally fight like The Harvest Lord and Prince Alicane. Maybe the mobs can have a low chance to drop like 1 or 2 of a spellement and the bosses drop like 2 to 4.
All Lore Spellements - Make them craftable. Have it so everytime you craft those spellements, you get like 10 to 12 of them. Also, don't make it so you need the TC as that causes way too many issues when crafting Lore Spells.
New Trainable Spell Spellements (Golems and others) - Dont limit them to events. Have them be accessible in other ways as well. If you are to keep them limited to events though, make it so you are guaranteed to get your school's spellements and make it so you obtain around 30 to 40 each time.
