Hey,
i have some questions about steady aim and the attribute.
Does steady aim amplify also skills? Like archers multi shot?
And does steady aim amplifies every attack and skill during this 10 seconds or just the first?
And atleast what does the attribute exactly? It gives every shot +x?
Does it work on every missile of multi shot too??
Greetings and thank you 
Yes steady aim is a buff that will instantly make all your damage +x%
for example I can put down magic arrow then cast steady aim and the next hits of magic arrow will benefit.
When you cast Steady Aim, for the next 10 seconds, ALL damage caused by you is increased. This affects active skills like Barrage, and DoT’s like Flare Shot, Broom Trap, and Magic Arrow. For example, shoot a Flare Shot then cast Steady Aim, and all of the flares will do increased damage until Steady Aim wears off.