Honkai: Star Rail features a turn-based combat system, which means all your characters will be on the field at all times, and they'll all take damage from the enemy. This makes healers, tanks, and shielders an integral part of the game since you have to protect your squishy DPS characters. Gepard is one of the tank/shielders in the game who has Ice as the combat type and with the right build, can make the team immortal.