The Yu Pagodas aren't strong and can't directly attack the party, but they heal Braska's Final Aeon and increase his Overdrive bar with Power Wave. They resist most elemental magic. The Pagodas will revive automatically after a short time of being killed, and when only one Pagoda remains it can use Curse on the party. They revive with as much HP as it took damage to kill them, so Break Damage Limit can work against the player here, quickly giving the Pagodas tens of thousands of HP.
Because destroying the Yu Pagodas is a double-edged sword (they come back after two turns, and they'll likely revive with more HP than before), and since the Yu Pagodas combined heal only 3,000 damage per turn (a well-grown party can deal more damage in one or two hits), it is generally the best idea to simply leave the Yu Pagodas alone and focus on Braska's Final Aeon.
During the battle's first part, inflicting Braska's Final Aeon with Zombie will negate the Yu Pagodas' turn (the first one that will attempt to heal the Final Aeon will inflict 1,500 HP damage instead of healing it, but it will also remove the Zombie status), and during the second phase, a party should be concerned with dealing damage to Braska's Final Aeon, who has 120,000 HP.
A good strategy is to use Slow on one of the Yu Pagodas. That way, they can't use their dangerous Power Wave in succession, making it easier for the player to keep up.
When fought alongside Yu Yevon, the poison inflicted by the Pagodas' Curse ability is Yu Yevon's only means of killing a party member, though this is immediately undone by the party's permanent Auto-Life, and can be avoided entirely by ignoring the Pagodas.
pagoda is a tiered tower with multiple eaves, built in traditions originating in historic East Asia or with respect to those traditions, common to Nepal, India, China, Japan, Korea, Vietnam, Burma, Sri Lanka and other parts of Asia.A