Tips for Damage Dealers on Drakes
First thing you need to know. You only focus on 3 spells:
Flame Spike (Button 1): Damaging fire attack causing 943-1057 fire damage and awarding 1 combo point at the cost of 10 energy.
Engulf in Flames (Button 2): Finishing move which launches a blast of flame igniting target for 1500 fire damage every 3 seconds. The effect can stack and will last longer per combo point up to 22 seconds. Costs 50 energy.
Flame Shield (Button 5): Finishing move to protect your drake. Shield surrounds you reducing all damage taken by 80% and lasting up to 6 seconds for max combo points. Costs 25 energy with a 30 second cooldown.
High DPS Rotation
Always start off with a 2 point Engulf in Flames, after that always do 2 Flame Spikes, WAIT until you have 85 Energy, then cast Engulf in Flames. This should mean that you are casting a new Engulf every 7 seconds or so, letting it stack and doing 1500 damage per stack every 3 seconds. By the end of the fight, you should be able to reach a ~20 stack of Engulf, meaning that you will be doing between 45 000-75 000 damage every 3 seconds.
Now, if Malygos focuses on you during the fight and you have less than 78,000 hp, you should have 2 combo points available, waiting for your drake to reach 85 energy. Wait for Malygos to finish casting the "Surge of Power" spell and immediately use Flame Shield to mitigate the damage. With 2 combo points, you can block the entire Surge of Power if you use the ability correctly. Then immediately build up 2 combo points again and return to your normal rotation. If you have more than 78,000 hp, don't bother w/ the shield since it wont kill you, keep doing your rotation... be smart about this though.
If he does Surge of Power on you consecutively (2-3), make sure you get that shield up. You only really need a 1 point shield to survive, theres a huge chance your stacks will drop but its better than dying.