Making archon like units in Warcarft III?

[Marok]

I want to make units like the archon and dark archon in Starcraft, which means I want two Lesser Voidwalkers to be able to merge into a Voidwalker and I want the same to two Voidwalkers and a Greater Voidwalker. The transformation requires a certain mount of wood. How could I do this in the World Editor in version 1.30.4?

 

[Uncle]

Merging Units

Can someone help me make it possible for three units of different unit types to merge into one unit, similar to the Archons in StarCraft. I want the units to be able to activate it with an ability. I do not think it is possible with the default abilities, but maybe someone can make a custom...

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