Corvus is really good in act5, but his damage falls off real quick in Act 6 unless you use suicides. Haven't played Hyperion myself but everyone says he's good. The awakened ability is much more valuable for Corvus tho, especially as you're in act5, he doesn't die to any passive damage as long as you have at least one charge.
i feel hyperion die from block damage @demonslayer5 so are u firing a sp3 as soon as u can? That gets you the cosmic charges (the sort-of nuclear symbol yellow ones). At r5 they give over 1k attack each and over 600 physical resistance each, so he hits hard and takes less block dmg then
i feel hyperion die from block damage