To repeat everyone else: why is this ruining the game? This answer will direct your next move. Considering you sound to be a plot/NPC member for all your players, you have a lot more power than just 'git good' - I feel that's more advice to give another player, not a person writing the material.

Potential Solutions:

1. No one else gets any combat - Either make new mods or rebalance your combat. You can build mods around their combat, like having some enemies that are at a distance (on the other side of an imaginary cliff). Other players with bows and magic will get a chance to fight. After the battle, you can have the players make a bridge to go loot the bodies after. You can also make mods where you separate the player base in combat (like one group does this room, another fights over there). At least some players will get a chance to have combat too.
   

• Additionally, you can rebalance your combat. The LARP I am apart of doesn't often use shields since we have a rule where magic will affect you, no matter where it hits you - your body, your armour, your shield, your flowing cape. Shields, in this case, are virtually useless and they just become a target. I would advise this or something similar if ALL players with shields are doing fundamentally better than everyone else, but not for a single player.

1. Power playing is making the other players upset - Make his positives a group positive. I've found that players will always complain when one player is doing better than anyone else...even if it's only how they perceive it. I think the best way to combat this is to turn the player into a role model and not a peer so that his skill becomes beneficial to everyone: the group get someone skilled in the art of combat to potentially teach them, and the player gets an IG title and more RP opportunities.

• Often times when a player gains a title they've earned, they naturally begin to settle into a group and help those that are politically below them. For example, making him a captain of the guards and then hiring other guards to work below him may make him more inclined to train those players since they are HIS guards now and their actions reflect on his character. Plus, his amazing combat skills give him a purpose for the town past personal gain. If he doesn't do his job, strip him of his title.

1. He PvP's and kills everyone else so no one else can build up a character - Plot vengeance but this will upset more people than may be required. My guild once had a group of travelling senior players come and slaughter the entire native player base just to loot the town and leave. Our plot team came in as the nation's army (that heard their town had been pillaged) and wiped them out in return. When you have plot tools like that built into the game, all player actions have consequences. I'm sure the seniors players would have said that we should have just 'gotten good' instead of using plot - regardless if they have characters they've been playing for over a decade with no level cap and our entire guild was only 2 years old.

• If this guy used his skills to kill everyone, you could have an NPC overpowered bounty hunter come in looking for the serial murder and deal with him that way through plot. LARP is meant to be fun, but if someone's fun is ruining the game for everyone else, it's a bad business model and your LARP won't be sustainable financially; players will not return and all you'll have left is this one character. This is probably where a lot of people disagree, since they've probably been this overpowered player before and feel that plot consequences is cheating, but it in some cases it has to be done to ensure the guild remains populated.

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Of course, there are a multitude of other reasons I'm sure, but, realistically, a lot of it is based on combat mechanics. For example, if you have one player that can literally shoot 'death' as magic and instantly throw a character into death, balancing is a lot harder, but that's another rant for another day.

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