Spell Upgrades

Many spells in 5e list bonuses you get for casting them at a higher level - usually small bonuses, occasionally substantial. I tend to add such bonuses to spells that don't list them as well, whenever I can think of one. This page lists all of the bonuses, though they are subject to change for balance reasons (I'm particularly nervous about the Shield bonuses).

First Level

• Shield: last an extra round for each 2 levels upcast
• Mage Armor: Grants 6 temporary hitpoints for each level upcast
• Identify: Identify an additional item for each level upcast
• Feather Fall: affect an additional creature for each level upcast
• Absorb Elements: the resistance lasts for an extra round for each two levels upcast
• Comprehend Languages: lasts 30 minutes extra for each level upcast
• Shield of Faith: lasts an extra 5 minutes for each level upcast
• Tasha's Hideous Laughter: DC is increased by 1 for each level upcast
• Silent Image: Size limit expands by 5 feet (in all directions) for each level upcast
• Faerie Fire: Cube size is increased by 5 feet in each direction for each level upcast
• Speak with Animals: lasts an extra 5 minutes for each level upcast
• Goodberry: berries restore one additional hitpoint for each level upcast
• Detect Magic: lasts an extra 5 minutes for each level upcast
• Disguise Self: lasts an extra 30 minutes for each level upcast
• Find Familiar: your familiar gains 5 hitpoint for each level upcast
• Grease: covers an additional 5 feet in each direction for every level upcast
• Tenser's Floating Disk: extra 4 inches of diameter and 100 pounds of capacity for each level upcast
• Unseen Servant: +5 feet of movement and +1 strength for each level upcast
• Black Ribbons: size of the cube increases by 5' in each direction for every level upcast
• Expeditious Retreat: Your movement speed is increased by 5 feet for the duration for every level upcast
• Sanctuary: You choose an additional target for each level upcast
• Protection from Evil and Good: You may choose an additional target for each level upcast

Second Level

• Misty Step: Take along an adjacent ally for each level upcast
• Knock: affect one additional object or lock for each level upcast
• Rope Trick: lasts for 30 minutes extra for each level upcast
• Locate Object: findable distance increases by 300 feet for each level upcast
• Zone of Truth: lasts an extra 5 minutes for each level upcast
• Darkvision: affect one additional ally for each level upcast
• Darkness: radius increases by 5 feet for each level upcast. Additionally, use the slot-level instead of 2 when comparing to light spells to dispel
• Conjure Scarab Swarm: one additional swarm of beetles for each level upcast
• Silence: lasts an additional 5 minutes for each level upcast
• Detect Thoughts: DC increases by 1 for each level upcast
• Crown of Madness: DC increases by 1 for each level upcast
• Suggestion: DC increases by 1 for each level upcast
• Web: +5 feet in each direction for every two levels upcast
• Phantasmal Force: DC increases by 1 for each level upcast
• Warding Bond: AC/Save bonus is increased by one for each level upcast
• Zone of Truth: Radius increases by 5 feet for each level upcast
• Augury: For each level upcast, treat the result as though you had cast it one fewer times since your last long rest. For example, your second casting in a day would have zero chance of a random reading if you have cast it from a level 3 spell slot.

Third Level

• Call Shadow Mastiff: 5 temporary hitpoints and 12 seconds additional duration for each level upcast
• Riptide: radius increases by 5' for each level upcast
• Hunger of Hadar: damage dealt increases by 1d6 for each level upcast
• Haste: Affect an additional ally for each two levels upcast
• Tongues: Affect one additional creature for each level upcast
• Fear: DC increases by 1 for each level upcast
• Major Image: DC increases by 1 for each level upcast (alongside the existing 6th-level effect)
• Speak With Dead: Duration increases by 10 minutes per level upcast

Fourth Level

• Evard's Black Tentacles: +1d6 bludgeoning damage for each level upcast
• Watery Sphere - 1 additional medium creature for each level upcast (an additional large creature for every four levels upcast)