Krayt is melee-class pet, and u can't get it on any mage. Gina is universal.
Gina gains 6 in strength and phys. armor until lvl 50, less str later. If i remember correctly, krayt stats are better. U can check this yourself if ur krayt is still young.
But if Gina is good enough for u as tank, u can give krayt rune to a druid in a cave for a good bonus. I don't know druid name in eng. He teaches u poison skills and basic druid shapeshift.
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