Which Topaz hero is best for tank?

[iamop]

I have currently Atalanta, Nether Knight, Shadowraith, and Djinni and I'm looking to replace Shadowraith. Which Topaz hero is best for tanking?

Also, my current gemming of tanks are HP, DODGE, and BLOCK. I add PDEF and MDEF last. Is this correct?

[iykwim]

Topaz? IMHO Nether Kn already fulfill that role,

As for your shadow wraith, I suggest to keep him for a while until you can afford your 1st ruby hero (90-120M gold)