Ability Sequence

Your ability sequence and knowing how to use your abilities is very important at the first 6 levels to your poking power and sustainability.

Arcanopulse
This is our first ability that we rank up to 5 because it's the one that gives the most poking power. Late game your Mage Chains and Arcane Barrage give the most damage output. Early game it is essential to master this first because it will help you to push the most and poke the most at early levels. This is Xerath's best ability to farm.

Locus of Power
This is our next ability that we max out, mainly because we need to reduce the cooldown on it so that it will work well with Arcanopulse. This also helps Arcanopulse to farm.

Mage Chains
Mage Chains is the final ability that we max out because it helps out in team fights, catching runners and escaping chasers. Using this with Arcanopulse and Locus of Power will work great in catching runners. If you are trying to escape don't pop out Locus of Power unless you know you have enough space and time to get out of Locus of Power and grab its speed buff.

Arcane Barrage
Your ultimate is very useful in team fights and picking out enemies. Make sure you don't use this to stun your opponent with Mage Chains, use this after stunning your opponent with Arcanopulse and Mage Chains. You also might want to pop out Locus of Power after stunning the enemy, just in case they try to make a break for it.