Need some Gm Advice

[JuliusCromwell]

I want to create a Mini Boss Npcs and some low level monks to challenge my group of players,

I want it to be a medium to hard challenge for them.

The party is a level 8 Magus who has range and regulag spell combat and spell strike (character boon)

A Ac loving monk who loves to use stunning fist

And a path of war character who uses the unarmed fighting style from those book

I want ompne were they'll need to work together to win

[JuliusCromwell]

The players are level 8

[Turelus]

If you haven't before then give this link a read.
It's a guide on building more challenging encounters.

Otherwise you can make encounters a bit more challenging by playing with the terrain in which they fight. Hamper their movement (difficault terrain), limit their sight (fog/mist), strong winds to mess with spells/ranged attacks.

Add some spell like abilities or a caster who's there just to CC/debuff/dispell them. In my current Crimson Throne game there were some low level cultists (clerics) who the players came to hate because they each cast spiritual weapon, then hold person before attacking.

If the enemy knows of your PC's have them factor in some defences vs their most common attacks.

[MisterV]

Have a series of encounters that deplete their resources. In my years of gaming, too many DMs have let us begin encounters prepared and fresh. Desperation makes for good role playing, good tension, and extra resourcefulness.