Cryptbloom was designed as a Void Staff alternative. This led down a pretty linear path:
- We don't want an item that does more damage than Void Staff, so it probably should have less pen and/or less AP.
- We can give it other stats if we want to fill out the stat profile. Haste makes sense here since by the time I was working on Cryptbloom I knew that there was going to be slightly less haste in the rest of the system (no mythic passives, nerfed haste boots, no 30 haste items, etc.) and we were willing to accept AP champions getting some of that haste back with a damage tradeoff. But HP was also something I considered, though I never actually tested that version.
- In keeping with #1, we want an effect that doesn't provide any damage, because we don't want this to compete with Void in terms of raw damage output. It also probably shouldn't be pure stats since that's what Void is, so it wants some kind of unique effect. Given the above reasoning, it shoul...