Gems of War

The fastest way at the moment is to get the troop WEREBAT or WEREVERINE (both could be bought for GLORY in the shop at the beginning of the current campaign) and fully trait it (the third trait is what we're going after).


If fully traited, they have 50% chance to create a Lycanthropy gem at the start of your turn. If you get FOUR werebats/wereverines on your team and play an easy explore battle or any battle at all, you will get one or two, maybe even more lycan gems every turn! Soon the board will be full of them and the achievement will be yours in a couple of minutes.

Edits:

Exploding the gems reportedly works just as well as matching them, so instead of one of the werebats/wereverines try using a weapon (such as Mountain Crusher) or a troop (like the Dragon Soul or a Leprechaun) that explode a large number of gems on the board to speed it up considerably.

Alternately use a hero class or troop that will increase the amount of purple gems to make matching easier. The Dusk's Aura talent on the lvl 20 Assassin hero class will give you a dark storm, for example. Or (as Ahayzo suggests) use the Dark Troll (troop) whose magic effect is doubling the number of purple gems on the board.

Without the werebat/wereverine the task will take much longer, but can be done simply by playing the game. You will get a lycan gem every once in a while. If you play explore in Ghulvania, there you will often get a werebat on the opposing team, creating lycan gems every turn. Also, other troops in the future will be useful, such as the Wereraven (part of the current campaign elite pass) or the campaign mythic Hatir & Skroll, which will convert all green gems to lycan gems.

For this achievement, I used a fully traited team of Greed/ Egg Thief/ Cedric Sparklesack/ and Wereverine. Same principle as the achievement for destroying 505 gems of the same color. Max out gold, destroy the board, and with Wereverine’s last trait, there’s a 50% chance each turn of a purple gem turning into a lycanthropy gem. Took me about 45 minutes. Hope this helps!