Notes from author
The Strength and Dexterity values are hand-optimized to maximize two-handed damage while maintaining all the other stats (in particular, 50 Vitality and the minimum Endurance to wear all the armor).
The armor is chosen because it looks awesome.
The halberd is capable of stun-lock. Try it if you don't believe me. It has a different moveset from the other polearms, like the Black Knight Halberd. If you spam its R1 attack, it will keep doing the same thrust attack, which is just barely fast enough to stun-lock.