In the events leading up to the End War, the Xel’naga Ouros used the ghostly image of Tassadar to give Zeratul the information needed to foil Amon’s dark plans. Now that the End War is in full swing, Ouros again uses the fallen templar’s image as he directly opposes Amon.
Unique economy.
Tassadar’s main building is a Void Shard, instead of using the typical legion of workers to gather resources, he siphons vespene directly into the shard and uses mineral deposits as resonators to allow him to summon armies of void constructs.
Tassadar gains 5 supply from each resonating mineral field under his control (up to 195 supply on a normal map, 150 in Dead of Night thanks to the single base). His ally can not mine from resonating mineral fields.
Since Tassadar does not mine minerals, all of his structures cost supply, with the exception of his expansion void shard, which he only has one of.
“Tassadar” himself is playable, and functions as a heroic worker, personally summoning all of his own buildings. Tassadar is also able to dismiss any of his own units or structures, refunding the supply.
Army
Rather than training units, Tassadar summons batches of void shades from void rifts, similar to Amon’s forces in the Scythe of Amon mission. These rifts cost 10 supply.
Similar to Nova, each batch has it’s own cool down. But unlike Nova you can summon as many Void Rifts as you want, as long as you’re willing to tie up the supply.
Each batch guarantees at least one of each unit in the batch, and the ground batches can be upgraded to have an additional one of each at no extra supply cost. Ground batches do not cost any vespene, air batches do.
Light Infantry Batch
Contains a random assortment of Zealot, Marines, and Zerglings, up to 5 supply.
Heavy Infantry Batch
Contains a random assortment of Immortals, Marauders, and Roaches, up to 10 supply.
Ground Anti Air batch
Contains a random assortment of Stalkers, Cyclones, and Hydralisks, up to 10 supply.
Fighter batch
Contains a random assortment of Phoenixes, Banshees, and Multitasks, up to 15 supply.
Warship Batch
Contains a random assortment of Carriers, Battlecruisers, and Brood lords, up to 20 supply.
Upgrades
Unit upgrades happen at the void temple.
Since Tassadar does not mine, all his upgrades only cost Vespene. However, your void temples costs 5 supply to create, so each one you have means less total supply for your army.
General army upgrades apply to all racial units, divided by air, ground, weapon and armor upgrades. Protoss shields benefit from the armor upgrades of their respective mobility type.
Static defense
Tassadar’s Void Shards attack enemy units with void lightning. In addition he can construct repeating crystals that extend the range of the void shard’s lightning. These cost 1 supply each, and must be placed within range of either a void shard or repeating crystal.
Structures
All of Tassadar’s structures use Blue and white recolors of amon’s void structures.
Here are the originals for reference.
Void Shard
https://vignette.wikia.nocookie.net/starcraft/images/4/45/VoidShard_SC2-LotV_Rend1.jpg/revision/latest?cb=20151125225108
Void Rift
https://vignette.wikia.nocookie.net/starcraft/images/a/ae/VoidRift_SC2-LotV_Rend1.jpg/revision/latest?cb=20151125223615
Void Temple (re purposed from void corruption.)
https://vignette.wikia.nocookie.net/starcraft/images/3/3f/VoidCorruption_SC2-LotV_Game1.png/revision/latest?cb=20160126042949
Repeating Crystal (Re purposed from Death grip Crystal)
https://vignette.wikia.nocookie.net/starcraft/images/9/93/DeathGripCrystal.png/revision/latest?cb=20180709143758