Buildings are role decisions
Structures are not background art — they are carry, control, and economy roles frozen into the map. PvE nights want gold income plus chokepoint DPS. Arena prep may emphasize burst towers and fast cycle times over long economy chains.
Compare quick reference tables on the best buildings page and element pairing on synergies.
PvE priority list
Gold Mine first, Machine Gun Tower at primary leak, Infantry Camp if single-target elites slip through, EMP when groups stack, wall upgrades when base chip damage accumulates. Laser cannons and decoys come online through fortress evolution after consistent clears.
Night diagnosis flows from the tower defense guide.
Arena differences
Arena building setups mirror PvP team comps — less economy, more immediate pressure. Fire and Lightning structures pair with burst heroes tested in the Arena equipment guide.