The Shadow of the Colossus spell granted Balkor perfect attack and defense at the same time. The energy the titan was made of could be used to perform physical attacks or be instantly converted into any other spell, even tier five.
Balkor could freely move inside the shadow body while remaining hidden, so even dealing him a scratch was a gamble that cost a lot of mana to try. On top of that, Balkor could repair any damage the construct sustained just by adding more mana.
"Hey! Not only that's an improved version of your old Death Ruler spell, but you've also stolen my thunder. Don't think you can fool me with theatrics. That's a hard-light construct covered in darkness. How did you learn how to do that?" With a wave of Manohar's hand, several runes of light came out of his robe.