Defensive Formations IV

Enhances Infantry Defense

Research levels

Cost, base research time, power, prerequisites, and total effect at each level.

Level	Bread	Wood	Stone	Iron	Gold	Research time	Power	Requirements	Effect
1	930,000	930,000	180,000	46,000	12,000	16h 40m	18,000	Academy 19 Reprisal Tactics IV 1	4%
2	1,100,000	1,100,000	220,000	55,000	14,000	21h 40m	36,000	Academy 20	8%
3	1,300,000	1,300,000	260,000	65,000	16,000	1d 9h 20m	54,000	Academy 21	12%
4	1,600,000	1,600,000	330,000	83,000	21,000	2d 2h	72,000	Academy 22	16%
5	3,400,000	3,400,000	680,000	170,000	44,000	5d 5h	101,250	Academy 23	22.5%