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Hmm, how do I preface this...?
Okay.
I'm assuming casting spells in AoC will have various casting-times (because generally this is true for most MMORPG's.). Some spells might be Instant-cast, some 1 second, 3 seconds. Maybe resurrection spells might take 10 seconds...etc...
So I'm thinking about Fantasy Novels, Fantasy Movies: The Big NUKE spells that are going to save the day, are the ones that take 30+ seconds to finish. And during that time, the Mage/Sorcerer/Wizard NEEDS the rest of the party to hold-back the monsters/enemies until he/she can complete his/her casting. Then, when it's complete and ready: They rain holy-hellfire down and obliterate the enemy.
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So, the point of this post:
In large-scale battles (Sieges, or vs. World Bosses) it would be exciting to have a similar experience; A long casting-time Ultimate/Powerful Spell that delivers wide-scale damage. Or a massive AoE buff/heal to the group.
BUT! Staring at a casting timer is boring. Right?
So, wouldn't it be fun; that during that casting-time, the Spellcaster is playing a small mini-game during this 'concentration period.'
I imagine: a Magical Glyph that is being drawn on the player's HUD. And they must re-create/trace the Glyphs accurately with their mouse pointer. Or something similar to this idea. Making the casting-time actually a fun and immersive experience. Maybe the spell damage is increased with a perfectly executed magical-glyph drawing?
Anyways, it was just a little thought I had.
A little 'concentration test' for Spellcasters, while they are long-casting a powerful-spell. If they need to move their character or get distracted for whatever reason, well; they can't exactly concentrate the way they needed to and the spell's effect is diminished or cancelled entirely.