@marciosmg
There are two variants that are tougher, the Gold Skeleton and the Black Skeleton. The Gold one carries a massive sword, that can take a huge chunk out of your life, but it's pretty easy to kill if you stick with magic, they don't roll and only run a bit slower towards you.
The Black skeletons are another deal in themselves, they can OHKO you with their lunge attack, and a single attack from them can take 4/5 of your health, and they attack fast as hell due to them wielding double Uchigatanas. You'll need some serious Block and Hit strategies to take them down, but Soul Arrow can do the trick as well, just make sure you're not left open to a counter, as you'll probably die.
To use their souls you'll need to find a specific NPC in the game. In the case of Tower Knight's Soul, you'll need to find Sage Freke in 3-1 and release him. When he's back at the Nexus, you can give him the soul, and he'll give you the spell for free xD
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
