I've been working possible ways to make the Armiger a better base class for this server (and in general maybe) by trying to figure out how to focus on the heavy armor aspect and maybe the combat styles with it (such as maybe a utility melee using charges and slams). Spiked armor, armor blades, and possibly even a two-hander focus.
Necromancer and Summoner I keep circling back around trying to make each different or perhaps a subset of the same class (such as an artificer for golem construction, necromancer for undead, summoner for elementals) where they have the same core abilities (a blast, a cone, a pet, etc) but their "focus/specialization" turns them into something a bit different.
Like a Necromancer would have lifedrains and other debuffs but the summoner would focus on elemental effects. The artificer could focus on making a pet that is immune to status effects and other durability/enchantment capabilities). The key being to not make them a "caster" but to make them centered around a pet and having basic self-utility abilities (damage output, buffs, etc).
I work on this kind of stuff a lot when I have free time during lunches since it's just a matter of writing notes.