Line Keias is more useful in small people battle like 3vs3 instead of 5vs5, because Good people will try to kill you as much as they can before you can grow.
What you firstly do with your starting gold is to buy 2 brooches. [All stat 4 I think?] and as you earn the money In the line, buy 2 more brooches and when you have more than 2250 gold, sell back all of your broochs and buy the Red shoes that gives you all stat and Movement speed.And you buy lots of all-stat items ... [ I don't know the name, but the bracelet that gives 40% atk speed and 10 all stats]. And after that, you buy the 3150gold sword , Ancient King's Gauntlet, Deathblow sword and go on as the game continues[In the Mid-game, you have to decide the items.]
How does it work?
The first thing you should know about is that Keias should be both creeping and getting money from the line at the same time. How to do that will be under here
What you should do is Summon Kain and send him to the forwarded line[past the line towers and near the enemy's base] so he gets all the money. and now you go creeping! This will give you lots of EXPS and moneys for sure.
So what skills?
The skills that you put in for Line Keias is Shield Stun, Knighthood, Blindfold[?] . Blindfold gives 36% all stats boost for your white stats, so you should give points to Blindfold lastly.
What stats will it get in about 40 minutes?
You will be up to about lvl 21, 390 ATK points, 90 DEF points and 4500 HP. For something like heath pati, Just go up to her and say hello and use shield stun and slice her.