[HoMM V]9 Race - Swamp! Is it needed?

For Chaos, I suggest adding the Necromancer's "Deadly Cold" and "Magic Drain" from the Academy. For Summoning, "Fog Cloud" and an analogue of Fire Warriors: "Water Warriors." For Light, "Twilight" and "Water Resistance" (an analogue of Fire Resistance). And for Darkness: the already mentioned "Eternal Darkness" and "Cursed Land." For the Luck skill: "Deadly Misfortune" and "Lucky Sorcerer."
I also suggest giving lower-tier creatures in the army 20% vulnerability to fire and 20% resistance to water.
Here are the schemes for obtaining second-tier skills:
Chaos - Lord of Cold
====================== Deadly Cold
Chaos - Magic Drain

Summoning - Fog Cloud
====================== Water Warriors
Summoning - Lord of Spells

Light - Protector - Water Resistance - Twilight

Darkness - Lord of Pain - Cursed Land - Eternal Darkness

Luck - Deadly Misfortune
====================== Lucky Sorcerer
Luck - Soldier's Luck

Added after 12 minutes
I've created a logistics scheme.
Logistics - Pathfinding - Silent Hunter - Plundering.