The diamond, which is a pet useful for stats and speed boost is very tough to get. Usually, pets can be achieved by reaching wave 25 or 15. Also, some can be earned by completing a campaign mission on a certain difficulty. However, the diamond is achieved by getting 80 coal (to get a coal, do Bonus Winter Wonderland insane or nightmare hardcore).If you do this a total of 80 times, you'll get the diamond.These are the negatives and positives about the diamonds:

+it has a cap of 800 for stats

+it gives a speed bonus

+usually has more then 100 upgrades

-required level 100

-tough to get

-can't shoot or bite

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