- 80 ability power = 1740
- is gold efficient without its passive.
- For 910 , or about 24.375 magic penetration. to be gold efficient, its passive must be worth at least
- Combining Piercing Thoughts yields 35.91 / 36.82 / 37.73 / 38.64 / 39.55% magic penetration (rather than 36.4 / 37.8 / 39.2 / 40.6 / 42% since percent magic penetration stacks multiplicatively). with
- The 35% magic penetration from becomes more effective as the target's magic resistance increases. E.g. magic damage dealt is increased by a factor of:
- at 30 magic resistance;
- at 100 magic resistance;
- at 200 magic resistance.
- The AD counterpart to this item is the (and its upgrades). However, it only affects bonus armor.
- Percent magic penetration stacks multiplicatively with other percent magic penetration abilities.