Hey Cameron, I just noticed in your previous post that you said Kalana enchanted Soul Reaver's
right hand (which you said he had pulled back in preparation for his punch) with psychic runes - but if you read my previous post, you'll see it was actually his left hand that he had pulled back (for reasons that should now be clear) and he was just using his right hand to guard. I assumed Kalana wouldn't make such an obvious mistake so I assumed it was the punch-ready hand that she enchanted. Might want to edit your previous post to say 'left' hand though, if you don't mind.
Anyway, on to what just happened:
Soul Reaver just socked Abbadon with a very powerful punch (what with Soul Reaver's strength and his big run-up), but other than the effect of Kalana's runes, the force of the punch isn't augmented in any other magical way.
What it did achieve was to deliver a Seeker rune into Abaddon. He's now cursed/enchanted in such a way that the caster of the rune will be able to make almost any projectiles or spells target (and track) the cursed individual.
Because Abaddon is thus cursed, Soul Reaver can now unleash his real attack (which he cast with the help of Blooddrinker's energies): those motes of light floating around him can project powerful destructive beams, but normally fire very inaccurately. Due to the Seeker rune though, they're all focussed with dead accuracy on Abaddon. Oh, and after a brief recharge, they'll be able to fire again. Needless to say, it's going to hurt.
For the closest approximation of what the beams would normally do/look like, see:
http://www.youtube.com/watch?v=5xkNyzzn-ssEDIT: Forgot to mention: in theory, other spellcasters in the area, if skilled enough, may be able to attune their attacks to the Seeker rune too and use it to help their own targeting. It would depend on how powerful they are and how much they know about runic magic though, and would require a few moments to initially pull off.