Here's another option:
- Don't change levels 1-4 and 7.
- Level 5 - Witch.
- Level 6 - Manticore.
Witches aren't very good at level 6 - the stat increase isn't significant, they aren't very strong, and their HP is justifiably low - they are ranged attackers, but at least they cast dark magic; otherwise, dark elves without dark magic wouldn't make sense.
Added after 2 hours and 54 minutes
And replace the manticores in the neutral creatures with a hydra, and make it more powerful.
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