20-30 tons could rip medium sized trees from the ground depending on the type of roots, and Etrigan specifically is in Superman's range because S-man is vulnerable to his magical origins. IDK if Superman is effected by the Red or the Green in the same way, but even still... this thing's in Gotham. We're not fighting Kryptonians. Ninjas and a few other independent mercs like Deadshot, Bane, and maybe some bigger version of Clayface. Nobody requiring splitting mountains. 

~KL~