In the games I've PT'ed the latest Rhyas, I've found her to seem somewhat one-dimensional. Generally speaking, her single dimension mimics the MKI Terminus to the detriment (IMO) of her fun-ness. Particularly, my strategy has been to hide her amid a crowd of friendly troops making sure to shore up the line so it will hold against an opponent bold enough to try to assassinate her early (Rhyas uses occultation on herself and rapports a beast that will serve as a speedbump against big enemies). When the battle is joined, the strategy quickly shifts to Rhyas rushing though both armies right at the caster and chopping its head off. The end (although I see how warlocks can hold their own a lot better by being able to transfer and then assassination fails). Similarly, if she fails to roll well enough to make the assassination work, her strategy has required too much bravery and leaves her doomed where she stands (in the midst of the opponent's army). Rather than having Rhyas depend on the single killing blow, I'd rather see her have tools to destroy various targets so Rhyas players can utilize more strategies than just waiting for that moment that the enemy's caster enters 10".
I've seen significant discussion trying to increase Rhyas' warcaster killing power, but I pose the question: Will that really make Rhyas more enjoyable?
Please note, this discussion is expected to discuss Rhyas strategy and competitiveness as she is. I'd like to refrain from "Here's how to fix Rhyas" discussion... There are other places for that.