eh. pains me to say it bluntly but this is kinda broken in many small to medium serious ways
meaning it is hard to turn it into something workable for a new player with little gear on first life in elite mid and high level heroic quests. I read this over morning coffee and then tinkered in the planer with it for nearly an hour, then was outside doing yard work for 2h while still pondering a bit and truth be told the chances of getting some non frustrating melee out of this are rather slim.
so without going into detail for now (im just on coffee break and gotta get back to work) ill stick my neck out the window and recommend heavy surgery for the patient: my advice is ditch the 4th rogue level, too. find a kind veteran player on orien or 2 who help you out with dumping some mid level syberis shards and some 50-70k plat for 4 mid level feat swaps on you out of the good of their heart. use that to bit by bit become a regular at fred's and swap out a bunch of feats:
replace magical training with toughness and get magical training back via spellsinger tier1 magical studies rank3
after that, bit by bit swap all other feats too:
pick up spell focus enchant
pick up empower healing
pick up heighten spell
at the next feat slot take quicken for safe emergency heals or maximise to boost damage on sonic SLAs from spellsinger.
put all AP not needed elsewhere into spellsinger as well as some low tier swash and warchanter for more songs. all further levelups to CHA.
change your playstyle to buffing the party with songs, healing with sustaining song, get a devotion item and use empower healing metaed cure med wounds to keep the barb up. use enchantment spells to make life for the party easier: open engagements with heightened hypnotism on the mobs to stun them. then drop a crushing despair to further lower their saves, follow up with making one minion with heightened suggestion, another with charm monster. after that use sonic blast and shout SLAs for some bit of added damage if you have SP to spare for dmg spells. deep slumber can put a group to sleep and the suggestion SLA costing one song from the spellsinger tree can charm multiple mobs. once you get it, use the mass hold SLA from spellsinger for easy targets for the barb, use the spellpoint regen song on the cleric and yourself.
this is still a lot of change and work, and yes im aware you liked warchanter more than spellsinger. but with swapping feats and going spellsinger you will end up more useful by lvl 15ish or so than say by putting yet 2 more levelups into dex to be able to take further 2 weapon fighting feats at lvl 16+, trying to get better melee gear and stun gear and weapons with procs like paralyzing and con damage and hpoping you proc as much as possible on your 2wf attacks.
the thing about melee is you kind of need a way to gain a crit increase and/or an enhancement tree with bang for your buck. the crits usually are tied to enhancements and are granted with 12 class levels for most classes. for bard that is in swashbuckler tier 5. however after looking at it, now switching to single weapon fighting is a bit late, not feasible anymore due to the requirements in balance and feat order. warchanter tier 5 has also a +1 crit multi on rolls of 19-20. the downside about going for warchanter imho is your low strength though. because the other shiny thing in the tree, the freeze stuns are based on bard level strength modifier + stunning bonuses hence your DCs will remain lowish on this for elite. the two weapon dmg seems better at first, but is not so great either unless you get further 2wf feats and have an enhancement tree that synergizes well with it like tempest or at least kensei.
the biggest drawback to melee though is your CON10. you should never ever roll any toon in this game with less than 14 CON starting stat. for a melee health this low is seriously punitive, more so on a light or medium armor toon in elite content.
on the bright side, you opened up various cans of worms that lead directly to very important learning processes about how builds in this game work. so this might turn out a bit painful but overall its not a catastrophe either. with that in mind dont give up and go for boring warlock next life. use the things you learn on this life to come up with a more focused and more pre-planed approach to building next time
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if you do not want to do so much respec, at the least get med armor proficiency from warchanter asap so you have at least some PRR added. sheltering item, max CON item, false life item would be important too with your CON. finding a stunning or combat mastery item, maybe even added with a second one that has a stacking insightful bonus AND a max STR item would be mandatory to get a chance at landing the freezes. also go for weapons that offer useful secondary effects:
http://ddowiki.com/page/Item:Sting
http://ddowiki.com/page/Item:Vampiric_Fury_Shortsword
these 2 come to mind in your level range.
if you want to try to up raw damage regardless try find weapons with increased crit profile:
http://ddowiki.com/page/Item:Axe_of_Adaxus i.e.
a lootgen weapon with paralyzing proc on it would also be something synergizing well.
if you do stay with melee you will need feat: improved critical slashing/piercing/bludgeon depending on your choice of weapon as soon as you can take it. you will also need to take lvl12 DEX levelup and lvl 16 DEX levelup so you meet requirements for improved two weapon fighting and greater two weapon fighting.
edit:
there might be one other way to gain some decent damage with warchanter while also further building on the freeze mobs capability. add the next 3 levels monk. this will net your a flat +20 melee power from henshin core 1 and core2. go for pyjamas and use the freezing ice tunic from the cannith challenges which has a freeze proc, too. for this you would also need to boost dodge though. in that case maybe swap magical training for dodge and quickdraw for mobility. also swap the 2wf for a staff and get quick strike from either henshin or rogue thief acrobat. with this added, go for the warchanter tier5. but well, truth is im bit clueless on monk, just remembered you are VIP and that the 3 level investment can get you a cheap 20 melee power. maybe somebody else better knowledgeable on monk can chime in if that would make sense with warchanter and freezing tunic ...
edit2: whichever way, how to proceed and make the best of things is worth some thought, so it might be wise to hold off on taking 12 and bank xp for a bit till you get some more advice and come up with a plan for your remaining levels. further taking a bit of this and that which looks nice at first glance will not add up to much and result in more problems -quests in the lvl10-12 range are getting noticeably tougher from before it's a bit of a watershed rly ...