'Ello there, I'm the cousin. I really like this idea for a resource but I think holding down the button might be a bit restrictive considering how the left mouse button is typically used for movement. A better yet similar system I think to crib from would the the 0%-100% charge meter from Secret of Mana (excluding the part where you hold a button down to charge up past 100% for a special attack of course since that would directly contradict what I just said).
Essentially each special attack would have something like 6 stages of power (0% 20% 40% 60% 80% 100%) allowing each ability to be variably used as a quick spamming move, a potent game changer, or something in between. A good regen rate I feel would be about 20%/sec with the bar maxing out at 100% from 0% only taking 5 seconds, with players ideally staying in the 20%-60% range. This would allow players to be rewarded for the kiting and maneuvering that ranged classes typically employ with larger 80%-100% forms of their attacks and conversely being punished for panicking and spamming weaker 0%-20% attacks since with the proper use of non-resource costing abilities (which would be primarily CC and evasion) a true 5TH CLASS HERE would never lose their FOCUS (the name for the resource I have come up with this very second).
I think with some adjustments to regen rate stuff and what exact abilities they'd need to be off the resource this could be a very fun and fitting mechanic for Diablo 3. Thank you for listenignt o my story the end, KQKyle grade 3. :goes back to desk to drink some fuckin apple juice:
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"I am afraid I am becoming more so with each terrible tick groused by that gaudy timepiece slung around your neck." In case it wasn't clear, Frigglish wore a clock Zazzerpan didn't care for. It was magic. "The massacre of Syrs Gnelph was not as written." -Complacency of The Learned by Rose Lalonde