Modifying Encounters for A Tier 4 Setting

[Palanan]

In the case of a setting limited to classes of Tier 4 and below, would encounters need to be modified in any way?

And if so, how exactly?

[zlefin]

Depends on how smart the monsters play; there wouldn't be too much need for modification, and the mods would be similar to those used in some low-magic campaigns. Which is the need for certain special abilities/spells to enable counters to some types of more advanced foes: specifically, can the party still deal with fliers/invisibility/incorporeal/teleporters/etc well? and can the chars heal permanent status ailments? (e.g. petrification)

In terms of power level, as long as people can keep up with WBL, they should be close to normal; you might want to aim the target CR down by up to 1; though on average the difference in power level should be less than a point of CR, unless the party is heavy on tier 5's and 6's.

[noob]

Remove monsters that kills characters fast against any party that is not made of clerics, wizards and druids.
For example medusas can petrify instantly and if there is no caster with stone to flesh it is basically instant death.

[Gavinfoxx]

I've got a thread about this

https://forums.giantitp.com/showthread.php?611110-Good-article-on-how-low-magic-games-break-3-xe-How-the-setting-demands-high-magic

It has several suggestions and mentions in the replies!

[Calthropstu]

No change needed. If you are running a module, they are severely underpowered. A group of fighters can generally take on most challenges (assuming each is built differently and at least one focuses on range).