<p>First of all, you're mixing up two different concepts: Regular Loot and Coop Loot.</p><ul><li>For <strong>Regular loot</strong>, all it matter matters is the amount of damage dealt. Taking damage, healing others, etc, does not affect regular loot. That is also commonly called "normal loot distribution".</li><li>For <strong>Coop Loot</strong>, which is also called <strong>Reward System</strong>, there are sets of rules as you implied. These rules, however, aren't the same for all bosses. On some of them, healing doesn't affect participation, and the weight of each contribution can also be different for different bosses. That's why it's almost impossible to answer your question, as specific tests would be required for each boss, and in most cases that is impossible. For more information regarding Coop Loot see "<a rel="nofollow" href="https://www.tibiaqa.com/10635/how-does-the-loot-in-bosses-with-the-reward-system-work">How does the loot in bosses with the reward system work?</a>"</li></ul>