Well few things:
1/ Necro only heal when you damage enemies' health. So if you can't break their physical / magical armor fast enough, there's no point. I also found armor buff and heal from Geo / Hydro skills are more useful than necro heal since armor also protect you from enemies stun lock and debuffs. Some weapons also have life steal % on them, so Necro heal is not that desirable. It does have some cool, useful skills like summoning bone widow, bone armor, blood sucker, but I wouldn't bother to get it past rank 3. Late game gears also have skills rank on them (eg: Necro+1 / Pyro + 1.... etc) so you can just shop for necro gears instead.
2/ Have a mix party, but focus on one type of damage is more desirable because physical and magical armor work separately. Crowd control is extremely important (for physical, you have knock down; and stun / frozen for magical), but these can only be applied to enemies when their respective armor is down, so focus on 1 type of damage / crowd control. Personally I go with 3 / 1 ratio (3 physical, 1 magic support for example).
3/ Enemies AI are pretty good, and they will likely go after members with lower armor, so tank with shields are not really useful. However, wand + shield combo is very viable for supporting mage since heal and buffs scale with characters and skills level, not with int. So having a shield on mage support boost their armor and help them survive / resist enemies debuffs.
4/ I love Summoning because based on the surface you summon your incarnate on, it can deal physical or different elemental magical damage. You will also have access to Dominate mind, which turn an enemy into your ally. You can add hydro / geo buffs and go full support. Though it's pretty boring as your incarnate / other party members will do most of the attacking. Still, having one of these in party make the game so much easier.
In the end, play the game and test several builds and find out which one suit you best.
Classic is not that difficult, so you have plenty of room to wiggle.
An example of party I've beaten the game with on tactician:
- 2 handed weapon user (2h / Warfare / Necro rank 3 / Pyro rank 1) -> deal heavy physical damage, knock down, can summon Bone Widow, Bone Cage, Haste buffs.
- Wand / shield mage support (Summoning max / Hydro / Geo ) ->Summon Incarnate champion, Dominate Mind, various physical and magical armor buffs and heal. Aero for teleportation is optional.
- Bow / Crossbow wayfarer (Ranged / Hydro / Geo / Aero / huntsman) -> Ranged Physical damage, off-heal / armor buffs, lots of special arrows to support team in any situation.
- Optional physical damage dealer of choice, preferably also have knock down, high dam rogue to cut through physical armor. My personal favorite is Finese spear user with Warfare / Poly / Rogue -> Extremely mobile with various teleportation skills, longer range melee attacks than other physical weapons, can knock down, or turn enemies into chicken.
Last edited by Duckling; 04/10/17 05:40 AM.