Introduction[]
Basically this is a Space Marine receiving a mere fraction of the power of a Primarch, and he becomes so fast that light seems frozen to him. Using the same method used in this calc here.
The feat[]
"The Spear of Telesto worked and Arkio felt as if he were merely a vessel for the weapon, like the igniter for an explosive power so far beyond him as to be unimaginable. And yet, every second the weapon sang in his grip, and the teardrop blade brought ruin to hundreds of Traitor Marines, he felt himself changing. Power the likes of which he had never dared imagine coursed through Arkio, and his mind struggled to grasp it. The closest thing he could approximate it with was his rebirth when he left the sarcophagus on Baal for the first time, but even that was a pale shadow compared to the majestic force running through him now. He was a hundred feet tall. He could see the passage of bolts and laser blasts as if they were suspended in the air. He was invincible. By the lords, he was godlike."
Laser weapons are indeed actual light.
"Laser Weapons, or Las Weapons as they are known in the Imperium of Man, are a family of directed energy weapons that produce beams of high-intensity amplified light to produce heat damage on a target. Laser Weapons are relatively easy to produce and maintain. No solid ammunition is ever used -- only power cells which can be recharged and quickly swapped with a fully-charged power cell."
Calc[]
Arkio's speed:light speed=Human speed:snail -> Arkio=Human*light speed:snail
Low End
c*5:0,001= 5000 c MFTL+
Mid End
c*6,35:0,001=6350 c MFTL+
High End
c*7,7:0,001=7700 c MFTL+