Summoners War - Guide & Tutorial - Useful 3 Stars Summon Monsters

Here's a list of Useful 3 Stars Summon Monsters that can be very good to start with and even for late game! Also a list of Fusion Monsters.

List of Useful 3 Stars Monsters

Monsters	Reason	Obtain
Griffon	Excellent early Speed monster with attack that is proportionate to target MAX HP with also an AOE decrease Attack Bar and Decrease Attack Speed. Good for Bosses!	Unknown Scroll Social Summon Fire Scroll Mystical Scroll Mystical Summon Secret Dungeon
Inugami	Excellent early Attacker with Group Attack, Multiple Single Attack and also with gain Additional Turn when kill he's target! Good in Dungeons or early PvP!	Unknown Scroll Social Summon Fire Scroll Mystical Scroll Mystical Summon Faimon Volcano
High Elemental	Excellent early Attacker and late game with an Ignore Defense Attack also with an AOE Increase Attack Power and Increase Attack Speed. Good in PvP!	Unknown Scroll Social Summon Fire Scroll Mystical Scroll Mystical Summon Vrofagus Ruins
Bounty Hunter	Excellent early Attacker with an Ignore Defense Attack, Multiple Attack with Chance for Continuous Attack also with an AOE Increase Defense and Increase Critical Rate. Good in PvP!	Unknown Scroll Social Summon Fire Scroll Mystical Scroll Mystical Summon
Harg	Excellent early Healer and Buffer/Debuffer and late game. Heal and Remove up to 2 Harmful Effects on a single ally and a Filly Up Attack Bar that also Increase Attack Speed. Good in PvP!	Unknown Scroll Social Summon Fire Scroll Mystical Scroll Mystical Summon
Elven Ranger		Unknown Scroll Social Summon Fire Scroll Mystical Scroll Mystical Summon

Available from Battle Maps:
Light - Bearman (Secret Dungeon)
Light - Fairy (Secret Dungeon)
Light - Inugami (Secret Dungeon)
Light - Vagabond (Secret Dungeon)
Water - Warbear (Mt. White Ragon)
Wind - Griffon (Tamor Desert)

Only Available by Summoning:
Fire - Elven Ranger (Mystical Scroll)
Fire - Frankenstein (Mystical Scroll)
Fire - Magical Archer
Fire - Mummy
Water - Frankenstein (Mystical Scroll)
Water - Battle Mammoth (Mystical Scroll)
Water - Lizardman (Mystical Scroll)
Water - Mystic Witch (Mystical Scroll)
Water - Werewolf (Mystical Scroll)
Water - Epikion Priest
Water - Grim Reaper
Water - Imp Champion
Wind - Penguin Knight (Mystical Scroll)
Wind - Living Armor (Mystical Scroll)
Wind - Epikion Priest
Light - Werewolf
Light - Battle Mammoth
Light - Amazon
Light - Grim Reaper
Light - Harpy
Light - Frankenstein
Light - Penguin Knight
Light - Golem
Dark - Battle Mammoth
Dark - Living Armor
Dark - Amazon
Dark - Harg
Dark - Harpy
Dark - Werewolf
Dark - Inugami
Dark - Taoist

Not 100% sure:
Water - Cow Girl
Dark - Elemental
Light - Cow Girl
Dark - Serpent
Water - Inferno

Note: Can be available in Exclusive Summon when inside the rotation list!