Invincibility in Starcraft

There are several ways to make units invincible in Starcraft.

First, select units can be made invincible from the start of the game by editing the unit properties.

Second, invincibility can be toggled (disabled --> enabled ; enabled --> disabled) during the game through the 'set invincibility' trigger.

For example,

Trigger("All players"){
	Conditions:
		Bring("Current Player", "Terran Wraith", "009", At least, 1);
		Deaths("Current Player", "Zerg Evolution Chamber", Exactly, 0);


	Actions:
		Set Invincibility("Current Player", "Alan Schezar (Goliath)", "Anywhere", enabled);
}

Units with invincibility enabled are not subject to spells, and special abilities, such as lockdown, maelstrom, psionic storm, stasis, mind control, etc.

Third, invincibility can be achieved by using a trigger to constantly refresh a unit's health or shield to 100%. This may not work if the unit takes in massive amounts of damage simultaneously. The unit can still be targeted by other units and be subjected to spells and special abilities.

For example,

Trigger("All players"){
	Conditions:
		Deaths("Current Player", "Mineral Field (Type 1)", Exactly, 0);


	Actions:
		Modify Unit Hit Points("Current Player", "Men", 100, 0, "087");
		Modify Unit Shield Points("Current Player", "Men", 100, 0, "087");
		Preserve Trigger();
}

Fourth, non-Terran building units are invincible if their basic health is 0. They can still be targeted by special abilities such as ensnare and lockdown.

Fifth, units may achieve very high evasiveness if they are subject to a repeating hyper-triggered 'move unit' trigger to a location where there is not enough space to move (i.e. body of water for ground units). The units subjected to this condition will not be able to move or attack.

Units are also invincible when they are in stasis. This can be disabled if they are subject to a disable/toggle invincibility trigger after being froze by an Arbiter.