Enemy AI : Targeting Priority Manipulator

The default VX Ace's enemy targeting behavior just pick a random target for any actions.
This script adds some AI targeting priority. With this script, the enemies become able to pick a target based on the action specific priority.

Download the script here. You might also want to look at the patches below.
Installation

Put this script below ▼ Materials and above ▼ Main Process.

Usage

In an enemy notebox, you can add some tags.

<target [action_id] [shortcut]>

where [action_id] corresponds to the enemy's action list, and [shortcut] corresponds to one of the implemented targeting priority method.

Example:

<target 1 high_hp>

This will make the enemy target the battlers with the highest HP value when using action number 1 (by default Attack).

<target 2 low_hp_rate>

This will make the enemy target the battler with the lowest HP percentage when using action number 2. If the action no. 2 is set to Heal, the enemy will proceed to heal its ally with the lowest percentage of health.

Available targeting shortcut is as follows:

low_hp
high_hp
low_hp_rate
high_hp_rate
low_mp
high_mp
low_mp_rate
high_mp_rate
low_tp
high_tp
low_tp_rate
high_tp_rate
self
not_self

If you want to make your own targeting condition, use

<target eval [action_id]>
[eval]
</target eval>

where [eval] is a ruby expression that takes returns -1, 0, or 1.
In the eval, a and b denotes the battlers that would be sorted.

For example, to make the enemy prioritize Eric when doing its ultimate skill, the tag will be

<target eval 8>
if a.name == "Eric"
-1
elsif b.name == "Eric"
1
else
a.hp <=> b.hp
end
</target eval>

Do note that target selection is done at the start of the turn, like actors. The enemy will not suddenly change target mid-turn, for example if its target had already healed.
Also, TGR have no effect on acquiring target.

Patches:
There is a patch for Schala Battle System here.