Quest making help

Does anyone know how to make the exclamation mark appear over a unit linked to an optional quest, and/or how to make the heroes to be able to level up past level 5 with just creeps?

P.S. The second one is like that in The Frozen Throne, heroes can only get 5 levels from creeps.

I'm going to assume you know how triggers work so for the first question the action is:
Special Effect - Create a special effect attached to the overhead of (the unit you want) using Abilities\Spells\Other\TalkToMe\TalkToMe.mdl

for the level up question you need to change a value in the gameplay constants, thats under Advanced- Gameplay Constants
the value is called
Hero XP Gained - Creep Reduction Table
The Initial values are 80, 70, 60, 50, 0
that means you gain 80% exp at level 1 70%at level2... ...0% at level 5
so you just need to change those values to the amounts you want.

Thanks for the help, Spectralist.:ggani: