Is it possible to craft a crystal similar to the Truedeath one, but for creatures with the Plant type?


Is it possible to craft a crystal similar to the Truedeath one, but for Plants?

Truedeath Crystal (Greater) and Demolition Crystal (Greater) are Weapond Augment Crystals (Magic Item Compendium, p.65-66) that let you deliver critical hits and sneak attacks respectively to Undeads and Constructs.

To craft a Truedeath Crystal the Consacrate (Player’s Handbook v.3.5, p. 212) spell is required and Disintegrate (Player’s Handbook v.3.5, p. 222) has to be used to create a Demolition Crystal.

First question:

1. Which spell could be selected as prerequisite to craft a sort of Vinestrike* Crystal?

*similar to the Vine Strike (Spell Compendium, p. 230) spell


The other thing is: Lesser crystals have “unique” abilities, while Least and Greater seem to be standardized.

DEMOLITION CRYSTAL

[…]

Least: A weapon with this crystal attached deals an extra 1d6 points of damage to constructs.

Lesser: As the least crystal, and the weapon is treated as adamantine for the purpose of overcoming the damage reduction of constructs.

Greater: As the lesser crystal, and the weapon can deliver sneak attacks and critical hits against constructs as if they were living creatures.

and

TRUEDEATH CRYSTAL

[…]

Least: A weapon with this crystal attached deals an extra 1d6 points of damage to undead.

Lesser: As the least crystal, and the weapon also functions as a ghost touch weapon (DMG 224).

Greater: As the lesser crystal, and the weapon can deliver sneak attacks and critical hits against undead as if they were living creatures.

so:

2. What kind of ability a lesser crystal could grant?