SC2Mapster

Auras are basicly Buff that emmits a periodic Search Area effect with filters set so it can target the right stuff. The search then useds an Apply Behavior effect to apply a second Buff behaviour which has a duration just longer than the period of the first buff. The second buff then modifies what you want.

I advise you read this for finding what fields to modify for the buff applied to the targets of the aura. http://wiki.sc2mapster.com/galaxy/data/behaviors/buff/

Also for altering damage look at the Combat - Modification - Damage Dealt Fraction or Combat - Modification - Damage Dealt (Scaled)

As for your map: For a start the passive command type does not work and is only used for dummy buttons, put your behaviour in the Behavior - Behaviors - Behavior field! As for the period of your buff being 0.001 secs, are you sure you want the aura doing 1k damage per second. The way your search filters are currently set up will make it damage everything that is not psionic including your own units and the casting unit (self). Otherwise looks fine.

If it is the latter it better have good health insurance because it will kill itself fast with it's own aura.

Your search and damage effect are Invincible allowed well were so it would still hit.

But on your preserver b you had removed the psionic attribute.

Make a stacking buff that does periodic damage so the longer the unit is in the aura the more buff stacks it gains. Look at my Transfer Behavior demo map to see a similar system.

You could use a Create Persistent effect using several smaller searches or searches with triangular arcs but for the really complex ones use triggers.