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Second, PIHC has also reworked unit types and divisions, adding a large number of differentiated units. The army is divided into: traditional infantry, heavy infantry (high defence, low speed), magic infantry (high attack, low defence), automated combat systems (line-fillers: cheap, low manpower, low quality), motorised infantry (high speed), special forces (unlike vanilla special forces, all PIHC special forces have abilities — for example biochemical units can apply a plague debuff to the Empire, field bands can raise friendly morale, and there are also ice archers, mine-laying units and more), light artillery, medium artillery, heavy artillery, light tanks, medium tanks, heavy tanks and Titans (super-heavy tanks whose scale, cost and strength far exceed vanilla). The air force is divided into six development lines: hot-air balloons, sky pirate ships, airships, aircraft, UFOs and skyward cruisers (aerial Titans). The navy is still in design, and currently includes riptides (fast boats), floating courts (ships), cardinals (carriers), submarines and leviathans (sea Titans).