Bumba's Hammer is a slower start to the game, but the pay off is huge. Try to play smart on the first few waves and prioritise getting a good reset for first rock spawn at 3 minutes.
Just keep pressing your buttons, they are always up. Make sure to play around your big mode passive to be at full power. You'll have a massive Pridwen shield to play around as well if the enemy team focuses you too hard. Keep an eye on your Berserker's passive proc - It'll increase your protections by 65% for the most value on Pridwen.
If you feel like you need extra damage over the prots of Dwarven in the build, Sunder is the best choice by far until it's nerfed.
This build can work just as easily with Bluestone if you prefer the added ability damage, over what Bumba's provides.
