My level 10 necromancer is trying to boost his skeletons. Usually I opt for skeletal archers, as mechanically it is easy and quick for me to roll 8d20's and not worry about them much (until the dragon kills them all in a breath and I make more). I have worked out with the DM that every day two 3rd level slots are gone to cast Animate Dead.
My skeletons have HP: 23 and Attack: +4 (1d6+6). Assuming 1/2 the attacks hit, generally damage tends to be 38 piercing--for a while I definitely was doing over 1/2 the party damage per round, but the enemies AC's have been increasing.
Occasionally the Oathbreaker paladin is around, and this can increase the skeletons melee damage to 1d6+10.
Also, I have been using the "Tiny" version of Animate Objects to have 10 attacks at 1d4+4, with a +8 to hit.
How can my party and I increase the Attack modifier or damage for a host of creatures like these, via spell or effect? For example, Bless, in 3.5, used to be "The caster and all allies within a 50-ft. burst, centered on the caster" but is now only 3 creatures.
Are there any spell buffs that effect larger amounts of creatures that can be used in these scenarios?