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Regarding artifacts, my imagination just can't come up with anything, but Heroes of Might and Magic IV really lacks creatures from other parts of the series...
Here are some ideas for creatures I would add:
- Pegasus (level 2-3, flying, first strike, magic resistance, Nature)
- Gnoll (level 2, stun, double strike, Chaos or Might)
- Ent (although there are Hives) (level 4, entangle, immune to morale, curses, and mind control, Nature)
- Manticore (level 3-4, poison, paralysis for several turns, Chaos or Death)
- Wyvern (level 3, flying, terror, Might or Death)
- Chimera (level 4, flying, fear, terror, poison, OP, Death)
- Golden Dragon (level 4, flying, antimagic, blind, Life)
- Basilisk (level 3-4, petrify, Might)
- Lizardman (level 1-2, ranged attacker, no penalty in melee, Chaos)
I can't think of anything else right now... Heroes of Might and Magic IV is a strange game - there aren't many factions, and there aren't a lot of neutral creatures either, but all the factions are designed in such a way that you can't add or remove anything... :)