The change this makes in the affected trees is genetic and inheritable.

This spell was created by the Guild Master of the Shadowed Eyes and she has shared it with no one.

Affliction [95] 
    Advantages [+620%] 
        Regeneration (Fast) [45] 
            Magical [-10%] 
        Regrowth [16] 
            Grows Back More Gnarled [+0%] 
            Bane (Fire) [-50%] 
            Magical [-10%] 
        Spines (Short) [1] 
    Zero Point Features [+0%] 
        Grows branches along the ground 
        This makes the spines difficult to avoid 
        This takes the usual growth time 
    Disadvantages [+8%] 
        Appearance (Ugly) [-8] 
    Extended Duration (Permanent) [+300%] 
    Malediction (As Regular Spell) [+100%] 
    Based on Activation Roll [+5%] 
    Emanation [-20%] 
    Only Affects Natural Trees [-70%] 
    Takes Extra Time 5 [-50%] 
    Magical [-10%] 
    Spell Components [-40%] 
        Must chant "thorn forest" in Latin 
        Must gesture with hands 
        Must dance and spin 
Level 2 [100] 
    Add Area Effect (2 yard radius) [+50%] 
Levels 3+ [+5/level] 
    Increase Area Effect by 1 step [+50%]