Sandro

"Sandro is an adventurer who has seen almost all of Enroth and Erathia. Now he serves under Finneas Vilmar, leader of the Necromancers of Deyja."
The Necropolis Leader whose highly explosive earth spells can inflict debuffs on multiple enemies.
A powerful hero who can end battle quickly and comprehensively enhance the power of all Necropolis units.
Sword of Frost is recommended.
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=How to obtain=
=Specialty=
=Spells=
Spell	School	Type	ManaCD	Description
=Adjutant=
=Masteries=
==Recommended by the game==
==Recommended by players==
Khaly:
There is 1 must have, Earth Magic, as it reduces the cooldowns on every spell, so you can push out more damage, heal, low morale and stun. 
Wisdom and First Aid are both amazing for Sandro. Wisdom is always good for the hero you are using, but not necessary. First Aid helps your units to stay alive, not only your vampire profiting from it but also your spells that end up healing more.
Tactics is good to make your tanks stronger, so you can stand longer in fights.
Pathfinding would help your main damage dealer, but it's not the best mastery. Sorcery and Scout would also be other two possibilities, but both only help 1 or 2 units.
If I were to make an overall ranking of the masteries, I would pick them in this order: Earth Magic >> First Aid >> Wisdom >> Tactics >> Mysticism >> Pathfinding >> Scout (with Angel) >> Sorcery >> Scout (without Angel) >> Resistance.
==Recommended spellmark by players==
Khaly: Mystic Domain
Once again there are multiple options here. Because Sandro is not mana starved like other heroes, he can work really well with active Spellmarks.
In my opinion the best is Mystic Domain, because it's an Earth spell, deals good damage and has utility (silence), hence works in all situations.
Small Death Ripple is also good for Sandro, since you are mostly using only Necropolis units so it won't hurt you. On the other hand in a mirror match or match against many Necropolis units, this mark would not only be useless, it would actually consume your mana. And when on auto mode, the AI is opponent insensitive and WILL cast it regardless of its usefulness in the match-up.
If you want a passive spellmark, I would stay away from Replenished Magic (Sandro already generates enough mana by himself). You can choose Mana Suppression or Earth Mastery (not yet released).
=Strategy=
==By Khaly (3rd August, 2020)==
1. What does Sandro play like and which players would enjoy him the most?
I think picking Sandro as your main hero is all about your liking of Necro units. He is very focused on this particular faction. Of course he uses a lot of spells, reduces cooldown of his ultimate with a little random factor, healing your units and hopefully damaging your opponent's (unless you're facing mirror matches).
The concept of Sandro is something like this: if he can find a chink in the armor of the enemy, he will completely roll over them in a domino effect (as one enemy falls after the other). For this reason, he is a much better attacking than defending hero.
The Necropolis defense units are there to buy you time so your spells can deal most of the damage, while in the meantime your chargers plow through the enemy's backline. If you like this kind of playstyle, then Sandro is the right hero for you.
2. What are Sandro's biggest strengths?
Most certainly the high damage done by his spells! His healing ability is probably the second best in the game.
Sandro is also focused most on 1 faction, which means he can focus only 1 faction Roster, which leads to great power bonus coming from it.
Both of his chargers (Vampire and Black Knight) have very high damage potential. Walking Dead grows significantly in power once ascended; not only does it have very high damage % reduction, but it also has a decent damage potential. Mummy decreases the potency of healing effects on the opposing side. Finally, Wight can silence a whole lane at the beginning of the fight, plus every enemy once it dies.
3. What about weaknesses?
He uses a lot of 9x units, which are known for their vulnerability to spells and damage itself. For every unit Sandro loses, he ends up overall dealing less damage and healing less often, on top of everything that unit was doing.
Sandro also needs to kill enemy units to generate a lot of mana, or he won't be able to cast his vast arsenal of spells often enough.
Finally, his focus on one faction makes him rather predictable and inflexible in the units he is using, unless the game will provide more in the future. 
4. Which would you say are the core creatures and why?
All 8 necropolis units are important to Sandro, so he can make the best out of his powerful 4* ability. More necropolis units means more mana regeneration and a higher chance to lower your cooldowns on your ultimate. All this which translates into more damage and more healing.
While I explain flex-spots when we talk about the formation, there are a couple non-Necropolis units you can also consider:
Earth Elemental 's primary use is to boost your Earth damage against enemy units, while as an extra, also improves resistance to Earth on your side.
Angel in general is a great support unit, that can help your units to survive even longer and deal decent damage.
Final synergy could be any units that apply bleed on enemies in order to trigger the 30% damage boost of Lich and Walking Dead.
5. What is your recommended formation for Sandro?
My favorite formation is full necro, with Power Lich, Dread Knight and Skeleton Warrior on the first line, Vampire Lord, Wight and Mummy on the second line, and Bone Dragon and Zombie on the bottom line.
I usually let the 3rd lane to be protected by artifact summoned creatures. First it's the Cloak of the Undead King spawned Skeletons, which also profit from every Undead upside, including the disease of Walking Dead. Secondly it's the incoming Baby Dragon of Power of the Dragon Father. I protect each other lane explicitly with a tank, each.
Bone Dragon goes behind Walking Dead to afflict enemies with Low Morale for extra synergy. Splitting the Chargers on two different lanes increases the chance of an empty lane, and if this fails, they become a 3rd melee unit on their respective lane. In particular I place Vampire Lord on the second lane so that both 1st and 3rd lane can profit from his AoE Heal.
When on offense, I generally put Vampire and Black Knight on the same lane to break through the weakest spot of the enemy (not 3rd lane if possible as you don't want your chargers stuck on opposing Baby Dragons).
If the enemy has a very strong lane, you may place double Tanks on it and if useful, silence the lane with Wight. Lich should help the chargers with the breaking through, and Walking Dead and Bone Dragon can take care of the rest. It's surprising how long Walking Dead can survive against multiple units.
For flex-spots, you can switch Skeleton and/or Mummy for Earth Elemental and Angel (or other units of your liking). Also Wight can be switched out if silence doesn't prove useful. All other units are necessary for Sandro.
=Lore=
=Skins=
Skin 	How to Obtain 	Bonus	Quote
Classic 	Acquire Sandro	- 	Death is a new life; my lies are merely intricate traps to trip and unsettle you.
Fatal Plot	Lore 	KNW+1	With one tiny drop you could topple kingdoms.
=Community videos=
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=Galleries=
==Concept Arts==
Sandro1.png|Classic Sandro
Sandro Fatal Plot.jpg|Fatal Plot Sandro