Does morale boost item stack?
So if you are not sure about understanding the Morale boost item, here's a look:
I am playing as Human race, my Elena, Rufio, and Avalon all have the Commander's Claymore items that allow my army to start the battle with higher morale. And also in the video, my Virion has the Vanquisher's Aegis set increase allies' morale. So the thing is I personally think that "effect does not stack" means that effect does not stack for only one hero. For instance, if my Virion wears a Vanquisher's Aegis set and a Commander's Claymore, the morale boost ability won't stack on the same hero.
And the calculation is simple, one hero = 2 allies morales boost. As you can see the last 2 battle in the video, with 4 heroes you can have 8 morale boost groups which are definitely insane. Just simply imagine that the combination of Bloodlust, Virion'Crusader Shield which reduces the damage taken up to 30%(lv6), Vega' Favor of the Sungod you can see how this is going for the late game. I don't have a chance to create more Commander's Claymore to test if it can boost for the whole army coz each Claymore cost you about 3k Alchemy Stone. And if it does, say good luck, have fun to your enemy legion :')
Advantages: PVP, siege battle (bronze vs golden, ie: Spearman (IX) + Morale boost + Heal + Shield > Templar (X) ),...
So, basically, it does stack together.
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P/s: English is not my native language, so if you don't mind, just mute the voice :')