So I haven’t seen much on the forums regarding how to make this a lot easier so I have decided to share my 2 cents.
I know plenty of people heavily value the purple warrior as it’s an incredible unit for hard summoner. This is because of it’s bulky 3/12 stats that are enhanced by Heavy Armor 3 making it completely immune to all green and blue dinosaurs and heavily resistant towards reds. The only easy way for the boss to clear this unit is through skill spam, and even then the purple warrior is still relatively tanky and enhanced by the 25% chance of revival. While 25% isn’t the greatest chance ever, it’s fairly good. Due to all of this being put into one unit, the purple warrior is the ideal tank when dealing with summoner hard mode.
The usage of purple warrior will usually have behind it a strong back line of magic units and physical ranged attackers. You can also have a strong melee unit behind it (preferably a berserker who can grow). Be wary to manipulate the health of the dinos in a way that the berserker will not move past a dino. Upon killing the unit in front of it, both the warrior and berserker are designed to move their maximum range. While this is great for the warrior who we are relying on to soak damage, you have to be more careful with the berserker who is fragile despite 10 health. Resistances are super important for tankiness.
For the above strategy, other tanks can do, but purple warriors are ideal. Alternatives are blue/green/white warrior (they are still the 2nd highest resisting unit). A lesser alternative is the purple knight (termed bully by my galaxy) who is unfortunately hampered by a movement of 1 per turn, but has 2 heavy armor. If you have none of these, you may just stick to guardians.
For the back line, priests and adepts are ideal; priests because they can heal, adepts because direct damage and highest damage.
What I’ve just listed is a fairly generic way, but there is another way that abuses the AI the best.
In my opinion, the rush strategy if executed successfully is the most reliable way to win hard summoner, simply because tank lines getting nuked by the summoner exposes your back ranks and everything can crumble. This is not true about the rush strategy. However, the rush strategy is hampered by the summoner pulling out green heroes. In addition, it is important to note that the two can be fused together, with a tank line used to host healers and adepts and various rush lines that you switch to until you can fill up three spots in front of the raid boss. Once you have achieved those three spots, stack units with jetpacks that will fill the spot and it is a guaranteed victory.
This is because the AI functions in a way that processes skills and units together (forgive me on terminology, I’m a layman in these regards). If the three slots in front of the summoner are filled, even if the boss nukes down one of those spots, it will not place a unit in that spot despite it being empty. This allows you to continually fill up those spots with no risk of a counter attack.
Hellfire is a great skill for forwarding the rush deck as it can pick off a few greens, but if a lane gets flooded by greens, your best bet would be to convert it into a tank line that can soak greens with ease. If there are two greens in front that means your purple warrior is effectively invincible unless skill killed.
The units you will use for a rush lane are the berserker, rogue, fighter and assassin. Always remember you can remove stunned heroes if you’d like damage output faster.
I know this is a large block of text so I will summarize/provide a tl;dr.
-Purple Warrior + a bunch of ranged units + maybe one strong melee unit preferably growing berserker. Ideal ranged units: Priest, Adept.
-Boss can’t place down anything when 3 slots in front are filled even if he skill kills. This means you can flood the lane with no problem.
-Use rogues, assassins, fighters, and berserkers because they have high mobility.
-Hold hellfires to get rid of greens if you want, if the lane gets flooded with greens, purple warriors are perfect stopper since no reds will be allowed through.
I’d also like to keep this open for discussion, so I’d like to hear how others do summoner hard with ease, what strategies work, or how I can improve on these strategies.