Hello!
Why Druids have the same death protection as Sorcerers, well.. They are two different vocations, although they are pretty similar, some things are different, like resistance for example.
Druids have more Earth & Ice protection than sorcerers, and Sorcerers have more Fire, Energy and Death protection that druids.
Why? Well that's just how Cipsoft wants the mages to be. They both have pros and cons and I think thats fair.
That being said, doesn't mean us druids can't be strong against Death damage :)
Here are some tips for more death resist as a druid:
Shroud of Despair +3% Death
Spellbook of Ancient Arcana +5% Death
Butterfly Ring +3% Death or alternative:
Death Ring +5% Death (duration: 8 mins),
Might Ring +20% Death (20 charges)
Koshei's Death Amulet +8% Death (cheap) or alternative:
The Cobra Amulet +9% Death (expensive),
Stone Skin Amulet + 80% Death (5 charges)
Lit Moon Mirror +5% Death
I also believe you can imbue
Book of Lies with +15% Death protection
And imbue
Bear Skin +15% Death Protection