I chose breeding, how interesting breeding the pets youd like to help you in  game

Still waiting for sailing
i want me a boat

Advanced Magics because it sounds the least game changing, though I'm sure Archaeology could be interesting.. perhaps being able to use that with a combination of other skills to create a powerful ancient artefact that improves your gameplay experience in one way or another... but then again, wouldn't that just be Invention v2?

Breeding ( ͡° ͜ʖ ͡°)

But seriously, it really would be cool if we could have a customization farm. Imagine the possibilities.

But getting back on topic, I would like to see Advanced Magic as Magic is the best skill in-game.

sailing. I think it could be amazing if the effort was put into it, I really love the arc and would like a skill to explore islands with

Necromancy would add a lot of depth to combat. It would provide buffs when you kill things, like draining their life force; things to sustain you beyond regular HP, e.g. you burn into that life instead of your own HP or use it to boost your own attack power

I kind of like the idea of breeding just because it seems easiest to synergize with other skills. Like you could unlock better familiars with breeding, or breed things for unique crafting/herblore materials. I dunno how on earth you synergize sailing, for example. Although maybe they could do something with The Arc and sailing.

High Magics and Necromancy seem like they'd function best as spellbooks. It seems tough to make a whole skill out of it.

Archaeology, it could link to so many skills - summoning skeletal creatures, crafting from remains found, mining digsites, prayer burying skeletons/bones, fletching making weaponry out of remains.

They all sounds boring to me. Maybe Necromancy, but I would rather see some interesting end game content than a forced new skill. Maybe increase Combat stats to 120 with some new gear and new bosses/minigames that give those. :-)

Archaeology, it could link to so many skills - summoning skeletal creatures, crafting from remains found, mining digsites, prayer burying skeletons/bones, fletching making weaponry out of remains.

Archaeology is the skill id love to see the most;

I could see it as an Elite Skill (Mining / Thieving / Dungeoneering)

You could unlock lost treasures of the world, new areas, forgotten magicks, historical items. Ive just always liked the sound of it

I don't.

Necromancy, I want dead stuff fighting for me

I'm not really sure what I feel the next skill should be. I know that I want a full skill released from 1-120 with content all the way through it. I want something REALLY in-depth with multiple avenues to take and choices with regards to training. Archaeology sounds like it could be the best choice out of your suggestions personally but I cannot produce a suggestion myself right now lol.

Archaeology Yehhhhhh   you never can tell what ur gonna dig up