[Excerpt - Elemental Council] The Secret Weapon of the Astartes

Swordlight, a cloned Tau fire caste commander, is reviewing footage from her recent fight with an Astartes named Artamax. She is trying to figure out what advantage he had that allowed him to beat her when finally she realizes the Astartes' most powerful weapon...

Swordlight dispelled her vain pessimism and rewound, watching again. She analysed the imagery, trying to understand the source of Artamax’s supremacy, the better to defeat him during their next encounter. It came down to the phalanges of his feet, she thought. The Space Marine’s ability to pivot his weight and axis, combined with his enhanced reflexes, helped him strike faster and harder than she could.

...toes