This is Seris's most used build (at least it should be the most used) i think these cards are just the best for this loadout. I really love Blood Pact in 5, but you can use it only in 3 or 4 if you want. Veil is a really important escaping tool, and i like to say, that you have to use it in level 4 or 5. Soul Forge is decent, it can be in 2 or 3 (some people use it on level 5, but i don't think so that this card is just has to be in that high level). The other ones are just fillers, so you can use them on level 1 or 2. Fade to Black is an interesting one, before the nerf it was basically the strongest Seris card, but right now is just a decent filler. Umbral Gift and Dark Whisper is for speed, which is a really good thing in Seris. Back then, i use Nether Siphon in everywhere, but now i use it only in few loadouts (it's a great filler tho). And Revenant is just obvious. Items are usually situational, but there are 3, which i think is obligatory: The most important is Chronos, since fade to Black got nerfed, you just have to buy Chronos, otherwise Shadow Travel is kinda weak. The second is Haven, cause Seris's Soul Orbs are a very weak and useless defensive ability. With Haven, Seris is more tougher. And lastly, Nimble, which is a very usable item, to dodge the enemy's attacks.