ComfyFactorio/modules/towny/combat_balance.lua

local Public = {}
local string_sub = string.sub

local balance_functions = {
    ['land-mine'] = function(force_name)
        game.forces[force_name].set_ammo_damage_modifier('landmine', -0.6)
    end,
    ['stronger-explosives'] = function(force_name)
        game.forces[force_name].set_ammo_damage_modifier('landmine', -0.6)
    end
}

function Public.research(event)
    local research_name = event.research.name
    local force_name = event.research.force.name
    local key
    for b = 1, string.len(research_name), 1 do
        key = string_sub(research_name, 0, b)
        if balance_functions[key] then
            balance_functions[key](force_name)
            return
        end
    end
end

function Public.fish(event)
    if event.item.name ~= 'raw-fish' then
        return
    end
    local player = game.players[event.player_index]
    player.character.health = player.character.health - 80
end

return Public