How useful is Valkyrie?
Valkyrie’s main purpose is not to kill things, but to protect you from the danger surrounding you. Although Valkyrie has lots of life (it gets boosted every difficulty level), it doesn’t do enough damage even in single player. Moreover, the damage she deals is not constant as the base damage of her weapon is changed every time she is summoned (computer generates random equipment for her). Therefore, it is recommended to put only one point as it is an extremely useful meatshield and can be re-cast again and again.