h) a line between caster and target tile - to enable spells like a penetrating earth bullet, doing 100% damage to the first target, 50% to the second and so on
i) a line to the left and the right of the target tile, so we can raise walls in front of the enemy, but also do cleave attacks from melee
k) a cone area, that expands the further away from the caster. Ie, breath of fire.
