But.. high-level Clerics and high-level Wizards can do just about everything in your example, too.
Those characters should be jsut as scary as the druid Sejs so vividly described.
A high level Cleric should be like [real world prophet / faith-founder] of your choice, bending the world to her God's will and making it look easy. Life and death - and undeath - mean nothing to her; solar archons walk at her side; she can raise armies against heretic nations and crush enture faiths if her God so chooses.
A high level Wizard is like this, but without the high power to answer to. Reality as caly in her palms, the planes themselves mere settings for her might arcane workings, etc etc.
Anyway, the problem is that it's really, really hard to maintain that feeling of awe if the PCs have any interaction with the druids
at all. As friends, foes, or patrons, simply encountering them strips away the chrome plating. Unless, that is, you use a dollop of silly deus ex machina, such as solve every problem with a display of power.
Remember how utterly badass the Borg were the first time they were encountered on Star Trek? Remember how they get less awesome every time they appeared, displaying vulnerabilities and being 'humanised'? Sure, that's good development, but bad for mystic awe.
