Mage casts a spell to emit tons of light so there are no shadows anywhere, then casts slow on the now visible shadow assassin.
Mage then casts an arcane armour on themselves before putting haste on themselves, too.
Mage then casts a spell to levitate and be out of reach from the shadow assassin's attacks before creating a shield around themselves a small distance away from the body to stop projectiles.
Mage then creates masses of spikes dripping in poison on every surface before causing the temperature to drop far below freezing.
Mage then casts lightning strike spells at the shadow assassin.
No idea what the shadow assassin would do.
'-'
*got bored due to not being skilled with battle scenes or being a good strategist*
>w<
X
"I know your skill set, Emil. I know it all too well. One by one, our Bishops have fallen to your hand. Today that ends. [Miniature Sun!]" With a wave of his hand, the archmage created a burning sphere of spinning, blind light.
No shadows remained under his will. No place to hide, or to use [Shadow Leap]. But plenty of room for Emil to cross the distance between them. He spun the daggers in his hand.
"I know your next thought. Our class has basically no armor." The Archmage waved again, casting, "[Greater Arcane Armour.]" and a shimmering armor of plate magic manifested around him. It reflected off the miniature sun, a shining, gleaming representation of his power.
"What kind of [Assassin] do you think I am? Do you think I don't have an armor penetration skills?" the assassin tilted his head to the side.
The old Archmage's face twisted into a frown in response. "[Levitation.] [Greater Mana Fortress.]" As he spoke he began to float in the air, a powerful bubble of mana flickering in the air around him before coalescing into a perfect sphere of burning mana. "Since you came, don't think about leaving!"
The mage waved his arms again, spikes ripping through the ground around them, dripping caustic acid that fell from every point, burning the floor.
"Impressive." The assassin said, standing awkwardly off to one side, having narrowly avoided an erupting spike. "You ruined your foyer in a single spell. It would've taken me at least two to do that."
The Archmage's face contorted into one of anger, tired of the assassins quipping. "[Greater Frostwave!]" he incanted, the world freezing around him. "[Endless Storm!]"
Lightning tore away from the Archmages palm, burning the air and flying towards the assassin.
"Is that all you have? Flashy, but no substance."
The Archmage jerked at this voice beside his ear. it sounded like the assassin, but--
He looked down. The assassin was gone, leaving nothing but a scorchmark.
He looked back. There the assassin was, laying inside of his mana bubble. Eating one of the apples he kept on his table in his foyer-- when had he--
That was his last thought before the knife entered his throat. His hands flew to it, his own blood choking him to death.+