They won't have limits nor will they die, but we have some thoughts on tamagotchi'ing things a bit where you have to feed active creatures in your roster or else they go into deep sleep and will need to be "awaken" at a certain cost. Other than that there'll always be an underlying cost to use them properly, ability points run out, their health gets lower which will cost you food and rest or mana to get it back up, etc. Same thing goes for healers and their mana and ability points.
At the same time we don't want to make it too punishing for players who go afk a few days only to come back and have to awaken creatures again so there may be a decent amount of time until they do so and/or you'll be able to use your bot helpers to feed them if they are afk which may cost a little. More on that as we get closer.
That is awesome, thank you for the detailed answer. So there will be a constant stream of things that we need to monitor and replenish. I'm assuming those can be bought with Zing, or any in-game tokens we can earn through playing?
we'll let u know as we get closer to it :D