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In similar vein to this and this:

Hydralisks and roaches have a special melee animation when the enemy is within melee-range. I thought this was just for show, and I've actually heard speculation that it's a bug, but Oak recently mentioned that this attack shares some of the other benefits of melee-attacks (namely, not being affected by the guardian's shield).

However, I wouldn't think their attack would be affected by melee-upgrade, since there is no listing for it on the unit-card. So which is it? (references please, I'm not looking for speculation)

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up vote 6 down vote accepted

They use the ranged upgrade.

If you open up the galaxy editor and look at the Hydralisk/Roach you'll notice that they have two different weapons: one for range, one for melee. You'll notice that both of these attacks have the same upgrade specified.

Here we see the relationship between Zerg Missile Attacks and Hydralisk Melee

alt text

If select Zerg Missile Attacks and select Upgrade Effects+ we can see where the association is set

alt text

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The pages for Roaches and Hydralisks, while less definitive, also show that they only have one attack, and that it uses the ranged upgrade. – Steven Sep 30 '10 at 21:54
I know blizzard at one point says "there is no difference only animation," but that was disproven by guardian shield. – tzenes Sep 30 '10 at 22:46
this sucks. they should use the melee upgrades when in melee combat – JohnIdol Oct 1 '10 at 7:03
@john some how using two different upgrades for one units' attack feels a little like penalizing Zerg – tzenes Oct 1 '10 at 15:38
yeah but it also means that if you upgrade melee for zerglings then you have it for Hydras and Roaches too ;) – JohnIdol Oct 1 '10 at 19:39

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