Doomslayer: an immortal human who can withstand the temperatures of hell, which is in the several thousands (in farenheit) in his universe, and has the insane motivation, strength, and durability we all love. Could probably beat every avenger combined except maybe thor and captain marvel.
T-1000 made out of liquid metal that can shapeshift into any form. Partially immortal, the only thing that could kill the t-1000 is extreme temperatures (liquid nitrogen combined with something to shatter the frozen body and molten steel boiling at approximately 1,500 degrees Celsius), and no exceptions. The t-1000 can form any type of melee weapon with its body. No ranged weapons, ammunition, or vehicles though. The t-1000 is resistant to all types of bullets. Only explosives can deter it for a decent amount of time, and the only type of bullet that can temporarily stop it is a 12 gauge shotgun shell. Also remember, our friend doomslayer is facing against a HORDE of these things.
Who would win?