Wall of Flame
Fire
Sorcery
Level 7
Range 6
Charges: 4
Create a {width} tile line of flames perpendicular to the caster
The flames deal 30 Fire damage in the affected tiles each turn
Only a single Wall of Flame can be maintained at a time
Casting the spell again removes the previous wall
Lasts 8 turns

Attributes:

30Damage
3Radius
8Duration

Upgrades:

2 - Feed the Flames
Wall of Flames' remaining duration increases by 1 when it kills a unit
4 - Thickened Wall
Wall of Flame is now 3 tiles thick instead of a line
6 - Fortress of Flame
Affects tiles in lines rotated around the caster, forming a square
9 - Flames of Heaven
When you cast Wall of Flame, cast Pillar of Fire on each affected tile
Adds the Holy tag