Puzzle Quest 3

Each hero starts with two unique spells and unlocks an additional spell at level 4 and 5.

So the quickest way to get this is to create 4 different heroes and get one of them to level 5.

You can create 3 heroes for free but the 4th hero slot will cost 100 of the blue crystals to unlock.

Quickest way to level up is by doing the campaign. You will be level 5 before you finish the first chapter.

Alternatively you have a chance to unlock spells when you open the chests that you get from dungeons. The rarer the chest the longer it takes to open but the loot is better.

They can also be purchased from the Shop and the Kingdom Bazaar with various different currencies from time to time.

Once you complete chapter 8 you will unlock the follower Xione who allows you to craft a spell every 6 hours at common rarity. As you upgrade her the time its takes to craft the spell will decrease and the rarity of the spell will increase.

* NOTE * I tried doing this with only three heroes and getting two of them to level 5 but the spells unlocked at level 4 and 5 on my 2nd hero didn’t progress the achievement tracker.