This is an important question you need to ask yourself before multi-classing your char IMO.
Too many people seem to want to do it for the wrong reasons.
Which really comes down to not knowing what kind of char they want to play in DDO.
Why do you want to do traps and locks?
This is most common multi-class idea....adding a lvl of Rog to do traps and locks.
I understand this all too well. My First char started as a Rgr, then I added Rog lvls, because I wanted to do traps and locks.
Then I added a Wiz lvl because I thought it would be cool to use wands.
In the end my char worked out well.......but it had nothing to do with my original reasons for wanting to multi-class.
I currently like my Rog lvls because of the SA damage. Not the trap skills.
Doing traps are boring!
And right after I reached lvl 20 and redid my enhancments for more damage and less traps........turbine gave us new traps that I will never be able to get!
So my original reason for Rogue lvls was more of a fad....whose day of fun is long come and gone. Yet my char and my choices remain.
Same with the Wiz lvls.
Offensive wands were a big disapointment. Back pack space to carry them even more disappointing.
Then we got the Knock spell.......how cool is that for a Rogue!
And Invisibility!
So I took more Wiz lvls.
And knock sucked!
And at the time Invisibility and stealth sucked! (it has snce been changed, and I have since been educated in its use)
So as you can see, I like many other noobs, chose to multi-class my char on a whim. And thought I was going to be gaining something I wanted.
When is essense, I did not really know what I wanted. Or what exactly I was going to get.
then I saw my firend's pure Rgr! Wow Brinks could kick butt! Yet I was very far behind in kills.
Now I regretted not staying pure. And he was gaining abilities that I could never gain.
So my next batch of chars were mostly pure class chars. And the pure class chars, I have never regretted staying pure!
I have since than made more multi-classed builds.
Some seem pure genious if they were to get capped. But capping them is a long difficult, gimped road........especially if their effectiveness is in question.
I also recently made clones of my original build. Because in the end, he was a good build. But starting over and doing things like taking Rog at lvl 1, could make him better.
But I'm already seeing things about him that I had forgotten. Mostly that at certain lvls, he is kinda gimped. And deciding exactly how to lvl up a multi-classed build and stay effective at all lvls is very difficult.
Anyway, I didn't mean to talk so much about my own decisions, just use them as an example.
The point is, you gain and lose many things by multi-classing a char.
And in some casses will not have the right stats to gain much from multi-classing in a certain class.
if you just started this game, you should really, really, really think hard before choosing to multi-class. Educate your self, and understand exactly what you will gain and lose.
But most importantly, it to understand what you want to play.
or how do you like to play? What type of char is for you?
if you really want to do traps, why not play a Rogue?
Rgr/Rog is good. Wiz/Rogue is good.
but why are you choosing them instead of just playing a Rogue?
You want to fight and cast spells....cool. But do you realise that a high lvl caster seldom has to fight at all. And that his martial abilities are severaly inferior to his spell casting?
So again, what kind of char do you really want to play?
DDO is different from PnP D&D.
Multi-classing is weaker because of the power of enhancments in DDO.
And the lack of prestige classes to combine spells casting classes and keep them powerful.
I really feel that too many chars are multiclassing as a fad.
because they saw someone else do something they couldn't, and they thought it would be cool to do that.
this game offers a lot of flexibility to make some cool chars.
But few are really superior to a pure class build.
In fact, the paths they give us during char creation are not bad at all.
No, they are not the way to be uber. But I doubt anyone playing this game less than a year, will actually make a beter build on their own.
You have slots to create additional chars.
Make a second, or a third. Try out different things.
Delete what you don't like.
Reroll! lvl 4-6 is easy to get. Rerolling if you are sure you don't like something is easy at low lvls. But making a second char is really what I recommend.
I just think that you need time in the game, to really understand what niche you like to play. What kind of char and abilities you really want. And how you like to play in game.
So it's very important IMO to ask yourself:
Why do you want to multi-class?