Phantom Chronicle: Leader Tricks 1

In Phantom Chronicle, elemental 'Boost' Leader Skills actually increase attacks against the weaker element, not boosting a specific element as the description suggests. The misleading description could have been because of a problem in translation (the developer is Japanese) or a past gameplay change.

Cockatrice has Light Boost II

For example, the Cockatrice has Light Boost II. The description in the screenshot suggests that the skill increases the attacks of Light allies. Note, however, the 210% against Dark in the same screenshot. Note too the buff given by the skill as shown in the next screenshot:

The Leader Skill gives an Anti-Dark buff.

These show that the Light Boost II actually increases damage against the weaker element, Dark. This buff also works on Phantoms that are not of the Light element as shown next:

Dark Grimoire with Light Boost II has 180% against Dark.

Dark Grimoire without Light Boost II.

This makes Boost Leader Skills very useful against specific elements, especially in Event Quests where there is only one element present.

Another direct application is when going up against a boss with Phantoms that are weak against it. For example, my highest-level Phantom is an Elder Griffin, a Plant-element that is weak against Fire. Normally, it would do only 80% damage.

Elder Blue Dragon has Water Boost I.

I set the Elder Blue Dragon as Leader just for its Water Boost I. This can be done even though the Elder Blue Dragon is level 1.

Everyone now has Anti-Fire buff.

Now, my Elder Griffin does 130% damage against Fire:

Elder Griffin with Water Boost I.

Elder Griffin is normally weak against Fire.

Phantom Chronicle, Contents