For my Fire Witch who is going to major in ignite and minor in some minions, do I want the Key Stone Minion Instability or is that better for a full summoner?
Depends on your build and what the goal of your minions is, having respectable minion health (or damage from MI) is pretty heavily tied to the minion life nodes and the support. Minion Instability is actually really bad if your minions don't have adequate life as the damage scales directly from your minions life, as well as making their effective health only 66% (they explode at or below 33% life remaining). This is all supposing you go standard zombies/skeles, if you're going spectres then you don't wanna go minion instability ever.Are you using fireball or fire trap? Just curious.
This is my basic plan (keep changing up a bit as I work through different skill trees. * Pure Caster eventually using Blood Magic gems for either one or two main spells (will manage Mana until about level 30 or so)
* Concentrating on Fire with ignite
* Main skill will be Fireball (10% quality in my stash), supported with LMP, Concentrated Attack and Fire Penetration
* AOE skill will be Firestorm (7% quality in my stash), supported with Increased Duration and Chance to Ignite
* Meat shield will be Raise Zombie supported by Minion Life (this is just to lightly distract enemies since the Lord of the Dead notable is easy to get with this build.)
* Curse skill will be Flammability
* Try to pick up as much life passives as possible
The following is one of a few perspective builds I am considering(I will include summary for easier reading). This build takes me to about act 3 of merciless based on my first character I am still grinding with.
http://www.pathofexile.com/passive-skill-tree/AAAAAgMA37CCEAelAuNr20myLJxJG6-3h2WOvhEtfINirKFt1p3N-riTEdunCJ2uEmkXHHF5GmwZhSSqNunjavrSZp7AGpBVp4QaOFnzrKpyqfcy-OtBqhRxBg5j_SWtCfYDxv0LpzAUIFBHcU2az0NjtzFY9Z3Ej0bQ0M9lVcYWb3NTEHQI9HkDMYhXK5wtHwI2xTbY8WzsVQdj5oHAVIi6NYAxAYgb74WXhSqN
Calculate
You have 84 of 120 nodes selected.
Here is your Summary:
Stats
+150 to Strength
+150 to Intelligence
Life
Minions have 10% increased maximum Life
166% increased maximum Life
Mana
60% increased Mana Regeneration Rate
8% increased Mana Recovery from Flasks
28% increased maximum Mana
Spell Damage
18% increased Spell Damage
Fire Damage
114% increased Fire Damage
Resistance
+15% to Fire Resistance
+16% to all Elemental Resistances
Cast Speed
9% increased Cast Speed
Armour
60% increased Armour
Energy Shield
60% increased maximum Energy Shield
Shield Block
2% additional Shield Block Chance
Minion
Minions deal 15% increased Damage
Misc
+1 to Maximum number of Zombies
+2 to Maximum number of Skeletons
80% increased Burning Damage
30% increased Burn Duration on enemies
30% increased Defences from equipped Shield
50% increased Block Recovery