Both are terms of ordinary English. The verb to visit something upon someone means to bring it to them. Grief, used colloquially, means harm or, more generally, bad things.What do "to visit grief upon her" and "the situation became charged" mean? Because both those seem like game-specific terms in your example.
Charged, of a situation, means that it is laden with potential for action or emotional response, as in "the atmosphere at the meeting was highly charged".