Archon of Runes

When you casts this spell, your spellbook pages ignite with spinning runes that swirl outward and assemble into a towering 15-foot avatar of arcane script, resembling a humanoid form made of floating pages, sigils, and frost-runes.
This “Archon” acts as a semi-sentient extension of your will and has the same amount as it's wielders HIT points upon casting it, it can't regain HP. It has an AC if 14

Upon Summoning in the location all in a 15ft cube range need to perform a DC 15 Dex save, on fail take 10d10 damage, in fail take half. 

Archon Actions (Each of your turns)

After the wielders turns, the Archon performs one action, chosen freely:

🜁 Rune Lance 

Make a spell attack through the Archon (wielders spell attack roll) 15ft range:

• Hit: 8d12 force damage, range 15ft.

🜂 Sigil Detonation 

Choose a point within 60 ft:
All creatures in a 15-ft radius make a Dex save or take:

• 8d6 force OR cold OR psychic (your choice each time)
  Half on success.

🜄 Ward of the Codex 

Choose a creature within 30 ft. It gains:

• Resistance to all damage until start of target's next turn

• And 10 temporary HP

🜃 Runes of Binding — Battlefield Control

Choose a point on the ground within 60 ft.
The area becomes covered in shifting runes for the round:

• Difficult terrain for enemies

• Alies gain +10 ft movement

• Enemies entering or starting turn there take 3d6 force damage