Played mostly as a druid all these years, back to time when druid was released, I tried to play mostly as summoner, but it is not "viable" (hate this word and it's context). As druid my favourite class, I hope that 3rd tree would be summoner tree.
SPOLIER: Wall of text!
We have spoken about summoner for a quite time now, but Turbine never "take that challenge". It's obviously now that spellcaster will be reworked, so it is gret chance to revive spellcasters. Druid is one of them, so lets talk about new tree.
If you want to be summoner, you should be prepare to spend enhancement points into something "other than yourself"- your pets, hires and summons. In other words, you should be prepared to invest into something that must be reliable. That means that you invest in hire and pet. Hires are ok (melee hires), pets can be ok if proper trained and heavy invested(feats and equipment). But, to be a summoner means that you should have something more, say army that is worth investing.
I councluded that best way to do it is to give another pet to druids. This can be wolf or bear, player choice (or maybe two bears). First one druid gets at 1st level, as it is now, second one should come later, 12+ lvl, maybe 15th. Wolfs are considered as sneaky DPS, bears should be considered as tanks. So, bears should have more HP, PRR, MRR, AC and so... How to do that- similar as druids wolf and bear forms (they badly need to be reworked!)in principle. Also, I would add one more things to pets- as it is now, wolfs can wear collar and armor, maybe we should thing about adding shield spot, either independant or instead of collar, at least for bears.
So, summoner now have two pets? One at 1st, another one at 15th lvl. Pets level is equal to level of druid. There is potential to add new feat- your pets level are equal your character, not druid, wizard or artificer level. We can also disccus WHEN to add another pet- at 1st, 5th or 15 lvl, that's for sure.
Assuming that you now have two pets and you can have hire (od owlbear or panther, but those are exceptions, should not be considered here), you now have 4 men to take care of (including youself). That's decent number and worth investing enhancement point and feat.
Enhancement should boost your army DPS and defences. Say that you want to invest 40-50 EP in this tree. What should you get, considering that you don't invest directly in yourself. You should get army that will not get killed in 3-5 seconds in EPICs and that can cope with Epic Elite. You should be able to do decent DPS (no matter if you are melee or caster) while your army shields you. Take a look of warlock summoner line- that's the way we want to find some hints.
Also, tree should be possible to offer some benefits ONLY for you, even if you don't want to play summoner. Reverse as swashbuckler tree- that tree almost only for bard himself, not for party.
1st core:
0.5 HP, 0.5 universal SP, 1 positive SP for you per point in this tree
2 HP, 1 melee power, 1 fortification, I PRR, 1 MRR for your pets and hires in this tree
2% positive critical chance per core in this tree after this one
2nd core:
+ 1 caster and max caster level for conjuration spells
+ 1 attack and damage to your pets and hires
3rd core:
+ 1 caster and max caster level for conjuration spells
toggle: when you cast spell (other than healing spell) on yourself, it is casted to your pets and hires (similar as Inspiring Echoes)
this should be true for barkskin, FoM, Stoneskin, Enveloping Swarm, Animal Growth, Fire Shield, Spiderskin, Crown of Summer- spells that are buffs
+ 1 attack and damage to your pets and hires
4th core:
+ 1 caster and max caster level for conjuration spells
SLA Creeping Doom
+10 healing amplification for you, hires and pets
+ 1 attack and damage to your pets and hires
5th core:
+ 1 caster and max caster level for conjuration spells
SLA Storm of Vengeance (this is conjurating spell, should go here, new one should be placed in Season Herald, earthquake or so)
+10 healing amplification for you, hires and pets
+ 1 attack and damage to your pets and hires
+ 2 to all stats for hries and pets
6th core:
+ 2 WIS, + 2 CON to you
+ 4 to all stats for your hires and pets
+ 1 DC Conjuration and transmutation
+ 2 caster and max caster level for conjuration spells
+ 2 attack and damage to your pets and hires
+ 5 double strike and AC for your pets and hires
Enhancements:
1st tier:
1/2/3 AC, attack, dodge and dodge cap for hires and pets
1/2/3 animal empathy + 5/10/15 positive spell power
1/2/3 heal, universal SP, damage for allies, and rank 3 +1 sneak attack dice for hires and pets
10% hitpoints for you and hires and pets as long as at least one pet is not standing still (2 EP)
+1/2/3 DR and 2/4/6 to trip, sunder for hires and pets
2nd tier:
Blood Moon Frenzy (from Nature Warrior tree)
Silver Moon Frenzy (when your hires or pets kill opponent you give +5 universal spellpower, 1% critical chance for spells and 1 attack and damage, stack 5 times)
expend use of wild empathy to give
SLA splinterbolt
+1/3/5 to saves for your hires and pets, rank 3 grants +1 stacking saves for you
3rd tier:
SLA fire seeds
your wild empathy regenerates, one per 2 mins
expend wild empathy to give +15/30% boost to damage and speed to hires and pets for 20 sec
+10 healing aplification and universal SP for you and you hires and pets as long as they are not stand still
whenever you or your hires or pets are damaged by some spell, you can get 5 spell power of that type, passive : +5 universal SP
4th tier:
SLA less vigor, mass
Spring Resurgence
can expend wild empathy to cast displacement on your hires and allies
Nature's mark: expend wild empathy to mark one target- all your hires and pets instantly attack him, and target gets -2 all stats, -20 fortification and attack speed
whenever you or your hires or pets are damaged by some spell, there is X% chance that X% of damage can be converted to temp HP or SP that lasts for Xsec, passive : +5 universal SP (say X is ok to be 10)
5th tier:
Crown of Summer (from Seson Herald. If casted on pets all gain benefits)
SLA vigor, mass
your pets get additional ring slot
+ 1 DC, caster and max caster for conjuration and transmutation spells
expand wild empathy to create sigil that heals your allies and damage opponent, similar as consecrating ground, lasts for 10 sec
Also, pets enhancement tree (its own, 2 pts per level should be reworked- trap, bluff, intimdiation doesn't work now. Heal from corpses should increase with level of pet).