[2020] Where has Thunderdeep Drask gone?

Since the early access version of the game was the last time Thunderdeep Drask was seen, why did the blaze escalation get so much love and attention with new behemoth variants. Why does the Classic escalation not get that in Some other update? The thunderdeep drask being in shock escalation exclusiveley would be totally fine with me, then shock escalation would be more crucial for mastery! The drask mastery is too easy right now since there are 2 whole objectives missing, and finally having a more challenging drask would be perfecly fine.