What is the effect of the Shield keyword when defending?

The Shield keyword fundamentally enhances a unit's defensive capabilities, granting it additional Might specifically when it is engaged in defense. This means that a unit with the Shield keyword can absorb more damage or withstand stronger attacks, making it a more formidable presence on the battlefield. The added Might reflects an increase in its protective capability, enabling it to either mitigate incoming damage more effectively or respond with improved power during combat, depending on the situation.

In terms of the other options, while they may suggest alternative defensive attributes, they do not accurately represent the essence of what the Shield keyword provides. For example, reduced attack strength, ability to counterattack, or evasion do not align with the focus of Shield as enhancing defense through increased strength rather than altering attack capabilities. This makes the Shield keyword a crucial part of defensive strategies in gameplay, emphasizing the importance of bolstering defenses to withstand and counter threats effectively.