Armor That Give Stealth Disadvantage

Padded, Scale mail, Half plate, Ring mail, Chain mail, Splint, Plate.

Spells

Perceiving a Caster at Work

To be perceptible, the casting of a spell must involve a verbal, somatic, or material component. The form of a material component doesn't matter for the purposes of perception, whether it's and object specified in the spell's description, a component pouch, or a spellcasting focus.

If a creature's spellcasting is innate then the casting of the spell is unperceivable.

Homebrew Rule: Contest a Dexterity (Sleight of Hand) check with a Wisdom (Perception) check to perceive a spell being cast.

Identifying a Spell

If the casting or effect of a spell is seen, an Intelligence (Arcana) check can be made by a character using its reaction (as the spell is being cast) or action on its turn to identify the spell. The DC is 15 + the spells level and if the spell is cast as a class spell and the character is part of that class the check is made with advantage.

Invalid Spell Targets

If a character casts a spell on someone or something that can't be affected by the spell, nothing happens to that target, but if they used a spell slot to cast the spell, the slot is still expended. If the spell normally has no effect on a target that succeeds on a saving throw, the invalid target appears to have succeeded on its saving throw, even though it didn't attempt one (giving no hint that the creature is in fact an invalid target). Otherwise, the character perceives that the spell did nothing to the target.

Size

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