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Yeah, you'll be waiting for the gates to open while the enemy is blasting you with chaos.
Тяжело в агонии, хорошо в гробу...
New here? I'm Roha — want a quick tour?
Friend, what's the point of the "Sudden Attack" skill? It's better to properly upgrade "Deleb" than to waste points on "Grok's Call of Urgash." Plus, you also gain experience.
Nimus is also quite good for large-scale games; he can overwhelm opponents with sheer numbers.
The Call of Urgash isn't a priority, in my opinion, but Grok is still one of the best on large maps.
For the Call of Urgash, it's better to use Nimues. In addition to this, level up his Luck, "Wide Gates of Hell," and "Master of Gates." He will be a strong hero, unlike your Grok... who has very few reinforcements.