You can use the 13 Confucius Sutra Internal to negate Reflect Damage. This one comes from joining the Confucius Sect and doing their 3rd quest (Ice Demon Prison).
Pure Reflect damage is negated cane be negated by Confucius Thirteen Sutras Internal Art or some other Legendary External. Non-common “reflect” damage source like “Damage transfer” from forest tree can be negated by attacking 1 square far from the target (very hard, lol).
So only touble when you need to attack bunch of Non-common reflect guys.