Aura of Warding. Friendly creatures within 10 feet of Arkades have resistance to damage from spells. Arkades is immune to diseases.
Barrier of Protection. Add 4 to any saving throw Arkades or a friendly creature within 10 feet of you must make one. Arkades may force himself to be the target of an effect that requires a saving throw instead of an ally within 10 ft. of him. This effect does not work on area of effect spells.
Divine Smite. When Arkades hits a creature with a melee weapon attack, he can expend one spell slot to deal radiant damage to the target, in addition to the weapon's damage. The extra damage is 2d8 for a 1st-level spell slot, plus 1d8 for each spell-level higher than 1st, to a maximum of 5d8. The damage increases by 1d8 if the target is an undead or a fiend, to a maximum of 6d8.
Font of Light. Arkades has a pool of healing power that replenishes every long rest. Arkades can restore up to 90 hit points. As an action, he can touch a creature and draw power from the pool to restore a number of hit points to that creature or expend 5 hit points from that pool to cure one disease or poison affecting it.
Ancient's Curse. As a bonus action, choose one creature Arkades can see within 30 feet of him. The curse ends early if the target dies, he dies, or he is incapacitated. The target is cursed for 1 minute. Until the curse ends, Arkades gains the a plus 4 bonus to damage rolls against the cursed target, attack rolls against the target are critical hits on 19 or 20 and if the cursed target dies, Arkades can give a friendly creature 8 hit points. Recharges on a short or long rest.
Spellcasting. Arkades is a 9th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 16, +8 to hit with spell attacks). Arkades has following Paladin spells prepared:
Cantrips (at will): Eldritch blast, Prestidigitation, Friends
1st level (4 slots): Hex, Expedious retreat, Unseen servant, Shield, Wrathful smite, Ensnaring Strike, Speak with Animals, Bless, Cure Wounds, Shield of Faith, Sanctuary
2nd level (3 slots): Blur, Branding smite, Charm person, Earthbind, Moonbeam, Misty Step, Lesser restoration, Suggestion
3rd level (2 slots): Plant Growth, Protection from Energy, Revivify, Remove curse, Daylight
Pact Magic (2 slots): 2nd level spells
Multiattack. Arkades makes two attacks with Druid's Promise or Pact Lance.
Druid's Promise. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 11 (1d8 + 7) piercing damage. On a hit, the target is affected by entangle until the start of their next turn. On a critical hit, the target is affected by Flesh to stone.
Pact Lance. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 12 (1d12 + 6) piercing damage. This weapon counts as magical for the purpose of overcoming resistance and immunity to non-magical attacks and damage. Hits with disadvantage when not on a mount or within 5 ft. of the target
Arion's Call. Arkades summons Arion the Pegasus to his side. When Arkades is mounted and cast spells that normally target himself, they can also affect Arion, and he is able to communicate with Arion telepathically as far as 1 mile apart. If Arion is subjected to an effect that allows it to make a Dexterity saving throw to take only half damage, it instead takes no damage if it succeeds on the saving throw, and only half damage if it fails. He can dismiss Arion at any time, as an action, and it also disappears if its hit points drop to 0.