What is a concentration check?

[Tanchyon]

Any idea what it is used for? Can't seem to find any info on it.

[Tanchyon]

Oh never mind, I just realized you can right click the purple text. Concentration checks help you avoid being interrupted while casting.

[Bluemoon]

In theory they are for spells that stay on the field/characters as far i know but from what i can tell they don't get used in the game or maybe only when certain difficulties are used I'm really not sure

[Lord451]

They're used when you're a spellcaster and in melee range of people. It's to prevent the AOO. If you succeed on the check, you cast defensively and they don't get a swing, if you fail, they do.

It's also used if you're struck while casting to successfully cast, or when you're taking continuous damage.

[Cutlass Jack]

Personally I find it easier to take a 5 foot step away from the enemy before casting and avoid the check entirely with pure casters. Probably more useful for hybrid melee casters.

[LordSith]

and reminder: shift +click to make the cautious steps before casting! do not waste your casting opportunity.

[[TGC] MadGod]

Every time you cast a spell and WHILE you cast the spell: If something happens to you that can distract you, you need to do a concentration check.

Alternatively, if you do not want something to distract you while casting in combat, you do a concentration check with a DC of 15+2*spell level.

The roll is d20+caster level (important, can be changed by negative levels)+attribute of the spellcasting class.

So if you want to defensively cast magic missile it would be a DC 17. A Level 1 Wizard with Int 18 would roll d20+1+4 to beat 17. So a 12 or better.

Taking damage while casting gives you a DC of 10+damage+spell level. Same wizard, same spell while taking 5 damage is DC 10+5+1 = 16.

There are many more DCs for various distractions, but I do not know if they coded them into the game and how.

If you fail a check, the spell is gone.