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And familiars? By level 5 I’m only situationally summoning them, they’re simply less valuable.
But that's not a reason to make it sometimes impossible and often a bit difficult to hit your chars with Bless and not the summoned minion.
And btw, I also disagree, some familiars are very useful also at lvl 5. I always summon Wyll's imp f.e., it's high mobility makes it very easy to considerably diminish the effectiveness of enemy ranged and casters, and it's also some additional damage. Not to speak of the animal companions of the Beastmaster Ranger, they rank from useful/very strong to absolutely overpowered at lvl 5. So the party can easily consist of 5 or 6 (or even 7 if the Ranger also summons the normal familiar).