Way to prevent magic damage?

how can i make a ability that will make a unit impervious to magic damage?
all magic damage will be negated is what im trying to do

it has to be able to negate carrion swarm, and so spellshield doesnt work right?

i tried defend out (there a option for magic damage) but i cant get it to work and negate magic damage

theres spell immunity, which negates all magic, but i want to be able to fire on the target like normal, its just the magic damage is negated
with spell immunity, it wont even allow me to target the unit saying unit is immune from magic

is there other ways to make it so unit is targetable and magic damage is negated?(from AOE like carrion swarm as well as single target ones)

use the item ability "magic damage reduction" and set it to 100% then your unit is immune to magic but can still become attacked by storm bolt ect

EDIT: oops sorry spell shield didnt read im going to test if spell shield can deflect carrion.

Ya, spell damage reduction in item abilities works.

ok that works , i havent seen much of rune bracer that why i didnt think of it

ok now, is there a way to make it work against most spell damage but let some through? because i wanna make some powerful spells that do major damage and a bracer shouldnt even be able to stop it

You could try removing the bracer ability from the target unit when the uber-spell is cast.

im not sure how to do that, because the uber spells have to do with kaboom and detonating on target, how would i set it up so it would remove bracer ability from any units that have it and are in the vicinity?

EDIT: would this work?

event - unit dies
unittype of triggering unit = goblin sapper,land mine,etc
pick all unit in range carrying rune bracer
action - deal 100 damage to picked units

something like that?

If the damage is done with triggers it will ignore that, And I think universal damage doesn't count for that spell

Maby you should just do the damage of the über-spell through triggers, instead?