Abaddon | Boss Battles Castlevania: LoS 2 Guide
Last update: 11 May 2016
Abaddon
Like Agreus, this boss is pretty easy to handle - he doesn't have any hard to avoid attack, his strikes deal moderate damage, and to make matter worse (for him) there are dozens of small monsters next to him, whose only purpose is to be a supply of Magic and healing for you.
Each time his life goes down by 1/3, he enters a berserk-like state - he starts to attack with his claws in a rapid succession, following your trail all the time. To avoid this attack, try to get away from him as soon as his health bar goes down by 1/3 - he needs a few seconds to "charge" his attack and you should use that time to get as far away as possible. This attack is unblockable, so don't even try blocking it - dodging isn't really a good idea either, because even if you avoid getting hit by one of his attacks, he brandishes his claws so rapidly that it's almost certain that you will get hit soon after.
Besides his frenzy-like charge attack, he can use an artillery attack, shooting projectiles up in the air, for them to fall on you after a few seconds. This attack is very similar to that of Raisa (in her Satan's Daughter form), but it's way slower than hers. Due to its speed it's almost impossible to get hit by any of those projectiles - try to be mobile and you should be fine.
Every now and then, Abaddon will drive his claws to the ground. After a short while a spike will burst from the ground (in the place you are or were just now), impaling you (if it hits you) and doing some damage. To set yourself free from it, you have to complete a QTE sequence. Fortunately, this attack is more annoying than damaging, so you shouldn't really be worried about it. To avoid it try to be mobile, as always.
When his health reaches 1/3 value, there's another berserk charge awaiting you, and when you drop his life near zero, a QTE sequence will be initiated - if you fail it you will be killed and brought back to a checkpoint. After that QTE sequence the fight will end.