There are many different ways to play your character in Vampire: the Masquerade - Bloodlines 2. The clan Banu Haqim focus on a stalking based playstyle to take out your enemies one by one, and the clan abilities are built to empower that. As we want to make sure this is not a game where you are required to optimize your abilities to the extreme, we’ve focused on making the base playstyles easy and straightforward. But for the players who want their experience to be a bit deeper and more customizable, you will be able to do so. By visiting important vampires who are sworn to assist the Sheriff (you), you can unlock abilities from their clan by drinking a bit of their blood.
Abilities from other clans may cost more AP depending on how well they align with your clans Disciplines. The Banu Haqim Disciplines are Celerity (speed enhancing abilities), Blood Sorcery (the ability to control blood with your arcane knowledge) and Obfuscate (abilities to easily hide, move without being noticed, and cast illusions.). If a Banu Haqim wishes to unlock a Blood Sorcery ability from another clan, it would cost less AP to unlock than an ability for a Discipline Banu Haqim don’t have. Those who unlock all abilities from a clan and get the Clan Perk, are able to stack them and have the effects of them all, elevating your power.
The activated abilities and Clan Perk can be learned from the other clans, but the clan passive can not. Because of this, you combine the clan powers in hundreds of different ways, but a Banu Haqim playthrough will remain its own gameplay experience.

Image: Ability tree for Banu Haqim with all clan abilities and the clan perk are unlocked. An ability from the Tremere tree has been equipped instead of Split Second.