Gross Misuse of C# Generics

EntityStats.cs

// Created by h1ddengames

using System;
using System.Collections.Generic;

namespace h1ddengames {
    [Serializable]
    public class ImprovedEntityStats {
        public Stat<int> hp;
        public Stat<int> mp;
        public Stat<float> strength;
        public Stat<float> intelligence;
        public Stat<float> luck;
        public Stat<float> dexterity;
    }

    public class Stat<T> : IStat<T> {
        public T value;

        public IStat<T> IncrementStat(T amount) {
            GenericMath<T>.Add(value, amount);
            return this;
        }

        public IStat<T> DecrementStat(T amount) {
            GenericMath<T>.Subtract(value, amount);
            return this;
        }

        public T GetStat() {
            return value;
        }

        public IStat<T> SetStat(T value) {
            this.value = value;
            return this;
        }
    }


    public interface IStat<T> {
        IStat<T> IncrementStat(T amount);
        IStat<T> DecrementStat(T amount);
        T GetStat();
        IStat<T> SetStat(T value);
    }

    public class GenericMath<T> {
        public static T Add(T value1, T value2) {
            dynamic a = value1;
            dynamic b = value2;
            return a + b;
        }

        public static T Add(params T[] values) {
            dynamic result = values[0];
            for(int i = 1; i < values.Length; i++) {
                result += values[i];
            }

            return result;
        }

        public static T Subtract(T value1, T value2) {
            dynamic a = value1;
            dynamic b = value2;
            return a - b;
        }

        public static T Subtract(params T[] values) {
            dynamic result = values[0];
            for(int i = 1; i < values.Length; i++) {
                result -= values[i];
            }

            return result;
        }

        public static T Multiply(T value1, T value2) {
            dynamic a = value1;
            dynamic b = value2;
            return a * b;
        }

        public static T Multiply(params T[] values) {
            dynamic result = values[0];
            for(int i = 1; i < values.Length; i++) {
                result *= values[i];
            }

            return result;
        }

        public static T Divide(T value1, T value2) {
            dynamic a = value1;
            dynamic b = value2;
            return a / b;
        }

        public static T Divide(params T[] values) {
            dynamic result = values[0];
            for(int i = 1; i < values.Length; i++) {
                dynamic n = 0;
                if(values[i] != n) {
                    result /= values[i];
                }
            }

            return result;
        }
    }
}