Talk:Master Yi/@comment-80.197.119.8-20110514203542/@comment-184.153.2.124-20110515061208

Thornmail is always good if you're having trouble against squishy AD champs. For 2000 gold, you'll take nearly half damage against melee attacks, and his attacks will hurt him for 30% of their damage, calculated before armor and scaling with your magic pen. 300 damage hits become ~175, and he'll be doing 100 damage to himself with each attack.