I have't got Slime Explosive Slyph (enggineer) in my racial ability.
I reset it more than 40 times.

Assuming that rate of it is 20 percent (1 in 5 glyph).
The rate i have't got it in 40 times is : 0.8^40 = 0.000132 = 0.01%
I wonder if i am a really really unlucky man or there was any error in this glyph?