Ultralisk Guide

Role
The Ultralisk is the tankiest Zerg hero. It excels in assaulting positions heavily fortified by turrets and barricade, thanks to it's large health pool and splash damage. While the Ultralisk soaks all the fire from the enemy, it's allies can dish out the damage. However, the Ultralisk is heavily dependent on items to reach full tanking potential, has the lowest damage, movement speed, and energy. Also, because it is melee, mines are a hard counter to the Ultralisk.

Skill Points and Items
As with all Zerg heroes, you should prioritize the first 4 skill points into claws for faster mining with 2 into mutation, for energy. You level up mutation further to 4, if no one on your team is using geysers.

Build Order
Get 9 carapace so that you can be a more effective tank, while being able to get level 3 sharp claws. Then upgrade claws while keeping mutation to a minimum of 3. Putting skill points in to claws will allow you to buy and upgrade armor from the shop. This build will let you gain items, but because of your low mutation, you are somewhat dependent on terrazine for supply. Also, high carapace means you should probably focus on roach spawners.

Ideal Setup
The ideal setup for items would be: Level 3 claws of either type (To mine very fast and deal damage), 2 level 3 Thickened Carapace (Extra tankiness), and level 3 Energy Glands(Compensate for Ultralisk's low energy pool).

Strategy
Early on, you should try to take advantage of the splash damage that you have to damage as many rocks as you can at once. This is very important because of the Ultralisk's poor damage output.

Later on in the game, after you got enough items, try to coordinate with your team to assault locations together as you'll be the tank and they'll dish out the damage. Don't forget to use Nydus Worms too. Just watch out for spider mines and tanks as they are your primary counters.

Abuse your tankiness to spread creep with impunity while attacking and provide vision for Ziggers. Even if you don't deal a lot of damage, it'll still take a long time to chase you off, providing valuable time and space for your allies.