@Archeia I was reviewing your entry until you said it's unbeatable. Is it a boss that you can fight again and uses the same mechanics later down your game?
I have it as an on map encounter. Right now it is over powered - as I have not ironed out the combat balance. However, the on map event is set to <approach>. But the trick is to avoid the ogre, get to the chest which gives the Ogres Tooth, and return out of the valley. Hypothetically, if a player does not want to grind to get strong enough to battle the ogre, then they have to avoid the encounter by drawing the ogre out, moving around it to get the chest open, and then escape. Discretion is the better part of valor.

When doing the encounter, there are four NPC encounters in the valley, where the NPCs tell the player to run. So, it may be frustrating to players that think fighting is the only choice.
Later in the game, the ogre will be in the big boss show down. There, it will have to be fought (yes, same mechanics). The 3 bosses from the quests, and then the Evil from the Abyss will be in the end battle.
Thanks and regards, LSA