The build you'll want is:
STR: 15
STA: 15
DEX: 15
INT: Everything.
As for Skills:
Bgvur Tialbold Level MAX
Asmodeus Level MAX
Prevention Level MAX
There are others, but they are all at Buff Pang.
Equipment:
Alext/Ales -> Billist/Billporon -> Grim -> Roenier/Roelayne
Get 5 of each these sets, upgrade them to +10 (should take you less than 5 stacks of Scrolls and Stones if you use Scroll of Smelting (High) for the first seven levels for each of them). Then fully element each set with one Element (+20 for each set, on each armor piece, and with a different Element for each set), and then use the ones that will get you to take little damage from your selected mob. Put the rest in your backpack.
Ultimate Guardian Knuckle -> Ultimate Angels Gloves -> Ultimate Bloody Knuckle -> Ultimate Ancient Gloves
Don't element these, though; just get them to +10. Use Jewels to get them to give you +6--- HP, and leave it at that.
Get the Champion's Cloak, for the Stat Boost and the extra 10% HP.
For Jewelry, you're going to want the Defender's set, for its epic HP and Defense boost. It'll also boost your STA so that you don't actually have to add anything to STA, assuming you are using Buff Pang Buffs. It'll give you 740 Defense Points, 80 STA, 10% Added Defense, 1018 Extra HP, 227 Extra MP, 100 Immunity Points, 500 extra HP recovered per second, and 500 extra MP recovered per second when maxed.
For Piercing, put in 4 Volcano Cards (7%) into all of your suits. If you feel like it, then you can replace some of them with Earth Cards (7%). Volcano Cards (7%) give you 7% Max HP per card, whereas Earth Cards (7%) give you 7% Max Defense. For your Knuckle, put in 10 Water Cards (A), as this will add to your INT, which is necessary for Bgvur Tialbold to be powerful. ALWAYS use a Refresher Hold/VitalDrink X (whichever one Bgvur Tialbold uses).
As for your second question, Asalraalaikum's strength is based on your total MP and STR. to get tons of damage for Asal, you should get MP+500 awakenings on your shield and weapon and armor. This will give you a total of 3000 extra MP. In addition, do the same to your Buff Pet and your Raised Pet (preferably an Old Fox) and you get 4000 extra MP! I'm not sure what the limit is for Blessing of Goddess, but I believe that it is 500 MP. So get yourself a CS set and start awakening! This will give you a total of 6000 extra MP! Now use a restat and go Full STR. Get your Ancient Knuckle to have a +75 INT bonus by using Jewels (or a 36% increase in PvP damage if you're going to use it for PvP), and pierce it with 10 Water Cards (A). Get your suit to have 4 Ocean Cards (7%) for a 7% increase in MP!
Asalraalaikum is used to one-hit everyone in PvP, and is best abused with a Refresher Hold. Yes, it can be used for Gianting, but everyone just uses it in the Arena.