[Spell] Shield ability

[Ziadoma]

I want to create an ability, which slows the caster and increases the damage reduction at the same time.

I tried using Berserk, but it does not work with negative values. Asides from that this would have been perfect.
I also tried defend, but with defend I cannot manage to get the special effect I added to be displayed.
My prefered way would be to have an buff with a special effect for the duration of the spells.

Is there a way to achieve this? I mean I could definitly trigger it, but I try to stay with vanilla ability if that is possible.
Thanks!

 

[Chaosium]

Using Defend seems like the easiest option to me, you can then add/remove a dummy aura with hidden icon to the unit to display the SFX and buff, can't really think of a base game ability that checks all the boxes

 

[Ziadoma]

Prefered for me would be to not have a toggle. I would like it to be actived and then the two effects take place aswell as the special effect. Maybe the best way would be triggers?