Wow you seem triggered. maybe you shouldnt discuss lore when you get angry so easily?
You think insulting others makes it fun to discuss anything with you? i can only imagine what it was like with you in school.
Literally noone has called Deathwing a master of arcane, because he isnt, being able to silence a mortal who is not even at his full power is not really a big feat for someone whos clearly a master of deception (incase you conveniently forgot krasus + korialastrasz were weakened by being alive at the sametime in the same timeline, dragons are also weaker in their mortal form and that was the krasus he silenced, and deathwing is known for his skill at deception throughout the history, clearly something like that is old god related since they are also all about deception)... and clearly you havent ReAd tHe bOoKs either since you dont remember that Deathwing was already mad by the time war of the ancients began. Its not like he whipped up the idea for demon soul during the war... hes probably been mad for decades waiting for the right moment to get all other aspects under his thrall, he cant fight against them when they are at full power. (as proven by the novel: Night of the Dragon)
You insult others of "terrible ignorance of lore" yet you vastly underestimate galakrond's size by not even knowing lore. (not to mention the other parts i already mentioned you seemed to have conveniently forgot. things i hadnt despite not reading the books in a few years)
From the quest Audience with the dragon queen, straight from alexstrasza's mouth: "His size alone was greater than all of the Aspects combined!"
Read it? it said "aspects" and as you mentioned they werent aspects yet when they fought galakrond so clearly galakrond was significantly larger than what they were before becoming aspects (probably double or triple atleast). The skeleton in dragonblight is just a skeleton, it doesnt show muscles or other fleshy bits that galakrond grew when eating.
Also you conveniently forgot how Deathwing himself literally claimed he would never willingly face Medivh in combat(Day of the Dragon) and had similar views of Thrall.
So yes strong mages could deal with him... Khadgar wasnt exactly a strong mage but he was very smart, perhaps even a "genius mage" like your favorite Krasus.
Khadgar most likely couldnt do it in Cataclysm because Deathwing isnt stupid... he 100% had prepared for such spells by... i dont know... adding WARDS to protect himself from such small spells he deemed insignificant earlier? thats literally what mages in the lore do all the time. Wards to protect vaults, wards to protect themselves, wards to prevent people from getting in your tower and snooping around (*cough* Medivh *cough*).
And what regeneration? Deathwing has regeneration? Ive never heard of it...care to elaborate? and without insults because its really cringe considering how badly you know the lore. I might have mixed up the hunger and meeting silencing but atleast im not being a b*tch about it when YOU massacre the lore. Regardless of that i doubt silencing some mortal requires more magical prowess than using endless hunger, one of the most dangerous spells in the world.
Literally the only thing i know for a fact from the books is that Deathwing has more like degeneration... thats why he had to give up demon soul and thats why he had to have goblins bolt plates onto him, because it was literally tearing him apart. Thats not regeneration, thats the opposite.
If theres a sentence where Kalecgos says that lemme know, theres not alot of books where he is in so you cant expect me to remember.
Regeneration doesnt help much if youre smashed... its not deadpool we are talking about here. Where was his regeneration when Khadgar split him apart? why did he run away if he had such powerful regeneration that only demon soul could kill him?