What are all these small numbers next to my hero portrait? Why are they in the way of Terrorblade's intimidating features? Why is my hero so dang squishy to right-clicks, especially in the late game (or, if you're feeding like me, for the entire game)? Trigger warning: This post will contain math. As our good friend Cheeks would say, Dota is just one giant math equation, so buckle up buckaroos.

Pictured below is a wonderful Terrorblade, prancing about in a practice match. The two red arrows point us towards his armor. What does armor do? Armor decreases the amount of damage you take from physical attacks (enemy right clicks, as well as lots of abilities like Anchor Smash, Quill Spray, Shadow Wave, Slithereen Crush, etc).

The number in grey is his main armor. Main armor is defined as a hero's base armor plus armor gained by agility. Base armor is different for each hero - Terrorblade starts with 7. Don't worry too much about base armor - IceFrog assigns each hero their base armor and there's nothing you can do to change it. But to understand main armor, you need this component. So once you take into consideration Terrorbale's armor gain from agility, and you wind up with 10.14, which gets rounded up to 11. Here's a fun math equation for all of you keeping score at home:

main armor = base armor + (agility * (1 / 7)).

10.14 = 7 + (22 * (1/7))

Again, that 10.14 gets rounded up to 11, and represents Terrorblade's main armor, which you see in grey. Each point in agility gets you a whopping 1/7th of a unit of armor. Is it super important that you remember that 7 points in agility equals 1 unit of armor? Probably not, but we're doing a deep dive into armor, so this is what you get.